diff --git a/Octokit.Reactive/Clients/ObservablePullRequestReviewCommentsClient.cs b/Octokit.Reactive/Clients/ObservablePullRequestReviewCommentsClient.cs
index 140bb5a7..6c33ae3d 100644
--- a/Octokit.Reactive/Clients/ObservablePullRequestReviewCommentsClient.cs
+++ b/Octokit.Reactive/Clients/ObservablePullRequestReviewCommentsClient.cs
@@ -93,9 +93,6 @@ namespace Octokit.Reactive
             Ensure.ArgumentNotNullOrEmptyString(owner, "owner");
             Ensure.ArgumentNotNullOrEmptyString(name, "name");
             Ensure.ArgumentNotNull(comment, "comment");
-            Ensure.ArgumentNotNullOrEmptyString(comment.Body, "body");
-            Ensure.ArgumentNotNullOrEmptyString(comment.CommitId, "commitId");
-            Ensure.ArgumentNotNullOrEmptyString(comment.Path, "path");
 
             return _client.Create(owner, name, number, comment).ToObservable();
         }
@@ -114,7 +111,6 @@ namespace Octokit.Reactive
             Ensure.ArgumentNotNullOrEmptyString(owner, "owner");
             Ensure.ArgumentNotNullOrEmptyString(name, "name");
             Ensure.ArgumentNotNull(comment, "comment");
-            Ensure.ArgumentNotNullOrEmptyString(comment.Body, "body");
 
             return _client.CreateReply(owner, name, number, comment).ToObservable();
         }
@@ -133,7 +129,6 @@ namespace Octokit.Reactive
             Ensure.ArgumentNotNullOrEmptyString(owner, "owner");
             Ensure.ArgumentNotNullOrEmptyString(name, "name");
             Ensure.ArgumentNotNull(comment, "comment");
-            Ensure.ArgumentNotNullOrEmptyString(comment.Body, "body");
 
             return _client.Edit(owner, name, number, comment).ToObservable();
         }
diff --git a/Octokit.Tests.Integration/PullRequestReviewCommentsClientTests.cs b/Octokit.Tests.Integration/PullRequestReviewCommentsClientTests.cs
index 9651d29a..e1c28f97 100644
--- a/Octokit.Tests.Integration/PullRequestReviewCommentsClientTests.cs
+++ b/Octokit.Tests.Integration/PullRequestReviewCommentsClientTests.cs
@@ -98,13 +98,7 @@ public class PullRequestReviewCommentsClientTests : IDisposable
     [IntegrationTest(Skip = "Requires Blob, Tree, Fork and Pull Request Api implementation")]
     public async Task CanCreateAndRetrieveReviewComment()
     {
-        var pullRequestReviewComment = new PullRequestReviewCommentCreate
-        {
-            Body = "A review comment message",
-            CommitId = _pullRequestCommitId,
-            Path = _path,
-            Position = 1,
-        };
+        var pullRequestReviewComment = new PullRequestReviewCommentCreate("A review comment message", _pullRequestCommitId, _path, 1);
 
         var createdComment = await _client.Create(_ownerName, _repoName, _pullRequestNumber, pullRequestReviewComment);
 
diff --git a/Octokit.Tests/Clients/PullRequestReviewCommentsClientTests.cs b/Octokit.Tests/Clients/PullRequestReviewCommentsClientTests.cs
index 1788a95b..fbdb9464 100644
--- a/Octokit.Tests/Clients/PullRequestReviewCommentsClientTests.cs
+++ b/Octokit.Tests/Clients/PullRequestReviewCommentsClientTests.cs
@@ -8,6 +8,79 @@ using Xunit;
 
 public class PullRequestReviewCommentsClientTests
 {
+    public class TheModelConstructors
+    {
+        [Fact]
+        public void PullRequestReviewCommentCreateEnsuresArgumentsValue()
+        {
+            string body = "body";
+            string commitId = "sha";
+            string path = "path";
+            int position = 1;
+
+            var comment = new PullRequestReviewCommentCreate(body, commitId, path, position);
+
+            Assert.Equal(body, comment.Body);
+            Assert.Equal(commitId, comment.CommitId);
+            Assert.Equal(path, comment.Path);
+            Assert.Equal(position, comment.Position);
+        }
+
+        [Fact]
+        public void PullRequestReviewCommentCreateEnsuresArgumentsNotNull()
+        {
+            string body = "body";
+            string commitId = "sha";
+            string path = "path";
+            int position = 1;
+
+            Assert.Throws<ArgumentNullException>(() => new PullRequestReviewCommentCreate(null, commitId, path, position));
+            Assert.Throws<ArgumentException>(() => new PullRequestReviewCommentCreate("", commitId, path, position));
+            Assert.Throws<ArgumentNullException>(() => new PullRequestReviewCommentCreate(body, null, path, position));
+            Assert.Throws<ArgumentException>(() => new PullRequestReviewCommentCreate(body, "", path, position));
+            Assert.Throws<ArgumentNullException>(() => new PullRequestReviewCommentCreate(body, commitId, null, position));
+            Assert.Throws<ArgumentException>(() => new PullRequestReviewCommentCreate(body, commitId, "", position));
+        }
+
+        [Fact]
+        public void PullRequestReviewCommentEditEnsuresArgumentsValue()
+        {
+            string body = "body";
+
+            var comment = new PullRequestReviewCommentEdit(body);
+
+            Assert.Equal(body, comment.Body);
+        }
+
+        [Fact]
+        public void PullRequestReviewCommentEditEnsuresArgumentsNotNull()
+        {
+            Assert.Throws<ArgumentNullException>(() => new PullRequestReviewCommentEdit(null));
+            Assert.Throws<ArgumentException>(() => new PullRequestReviewCommentEdit(""));
+        }
+
+        [Fact]
+        public void PullRequestReviewCommentReplyCreateEnsuresArgumentsValue()
+        {
+            string body = "body";
+            int inReplyTo = 1;
+
+            var comment = new PullRequestReviewCommentReplyCreate(body, inReplyTo);
+
+            Assert.Equal(body, comment.Body);
+            Assert.Equal(inReplyTo, comment.InReplyTo);
+        }
+
+        [Fact]
+        public void PullRequestReviewCommentReplyCreateEnsuresArgumentsNotNull()
+        {
+            int inReplyTo = 1;
+
+            Assert.Throws<ArgumentNullException>(() => new PullRequestReviewCommentReplyCreate(null, inReplyTo));
+            Assert.Throws<ArgumentException>(() => new PullRequestReviewCommentReplyCreate("", inReplyTo));
+        }
+    }
+
     public class TheGetForPullRequestMethod
     {
         [Fact]
@@ -131,13 +204,7 @@ public class PullRequestReviewCommentsClientTests
             var connection = Substitute.For<IApiConnection>();
             var client = new PullRequestReviewCommentsClient(connection);
 
-            var comment = new PullRequestReviewCommentCreate
-            {
-                Body = "Comment content",
-                CommitId = "qe3dsdsf6",
-                Path = "file.css",
-                Position = 7,
-            };
+            var comment = new PullRequestReviewCommentCreate("Comment content", "qe3dsdsf6", "file.css", 7);
 
             client.Create("fakeOwner", "fakeRepoName", 13, comment);
 
@@ -156,37 +223,13 @@ public class PullRequestReviewCommentsClientTests
             string path = "file.css";
             int position = 7;
 
-            var comment = new PullRequestReviewCommentCreate
-            {
-                Body = body,
-                CommitId = commitId,
-                Path = path,
-                Position = position,
-            };
+            var comment = new PullRequestReviewCommentCreate(body, commitId, path, position);
 
             await AssertEx.Throws<ArgumentNullException>(async () => await client.Create(null, "fakeRepoName", 1, comment));
             await AssertEx.Throws<ArgumentException>(async () => await client.Create("", "fakeRepoName", 1, comment));
             await AssertEx.Throws<ArgumentNullException>(async () => await client.Create("fakeOwner", null, 1, comment));
             await AssertEx.Throws<ArgumentException>(async () => await client.Create("fakeOwner", "", 1, comment));
             await AssertEx.Throws<ArgumentException>(async () => await client.Create("fakeOwner", "fakeRepoName", 1, null));
-
-            comment.Body = null;
-            await AssertEx.Throws<ArgumentNullException>(async () => await client.Create("fakeOwner", "fakeRepoName", 1, comment));
-            comment.Body = "";
-            await AssertEx.Throws<ArgumentException>(async () => await client.Create("fakeOwner", "fakeRepoName", 1, comment));
-            comment.Body = body;
-
-            comment.CommitId = null;
-            await AssertEx.Throws<ArgumentNullException>(async () => await client.Create("fakeOwner", "fakeRepoName", 1, comment));
-            comment.CommitId = "";
-            await AssertEx.Throws<ArgumentException>(async () => await client.Create("fakeOwner", "fakeRepoName", 1, comment));
-            comment.CommitId = commitId;
-
-            comment.Path = null;
-            await AssertEx.Throws<ArgumentNullException>(async () => await client.Create("fakeOwner", "fakeRepoName", 1, comment));
-            comment.Path = "";
-            await AssertEx.Throws<ArgumentException>(async () => await client.Create("fakeOwner", "fakeRepoName", 1, comment));
-            comment.Path = path;
         }
     }
 
@@ -198,11 +241,7 @@ public class PullRequestReviewCommentsClientTests
             var connection = Substitute.For<IApiConnection>();
             var client = new PullRequestReviewCommentsClient(connection);
 
-            var comment = new PullRequestReviewCommentReplyCreate
-            {
-                Body = "Comment content",
-                InReplyTo = 5
-            };
+            var comment = new PullRequestReviewCommentReplyCreate("Comment content", 5);
 
             client.CreateReply("fakeOwner", "fakeRepoName", 13, comment);
 
@@ -219,23 +258,13 @@ public class PullRequestReviewCommentsClientTests
             string body = "Comment content";
             int inReplyTo = 7;
 
-            var comment = new PullRequestReviewCommentReplyCreate
-            {
-                Body = body,
-                InReplyTo = inReplyTo,
-            };
+            var comment = new PullRequestReviewCommentReplyCreate(body, inReplyTo);
 
             await AssertEx.Throws<ArgumentNullException>(async () => await client.CreateReply(null, "fakeRepoName", 1, comment));
             await AssertEx.Throws<ArgumentException>(async () => await client.CreateReply("", "fakeRepoName", 1, comment));
             await AssertEx.Throws<ArgumentNullException>(async () => await client.CreateReply("fakeOwner", null, 1, comment));
             await AssertEx.Throws<ArgumentException>(async () => await client.CreateReply("fakeOwner", "", 1, comment));
             await AssertEx.Throws<ArgumentException>(async () => await client.CreateReply("fakeOwner", "fakeRepoName", 1, null));
-
-            comment.Body = null;
-            await AssertEx.Throws<ArgumentNullException>(async () => await client.CreateReply("fakeOwner", "fakeRepoName", 1, comment));
-            comment.Body = "";
-            await AssertEx.Throws<ArgumentException>(async () => await client.CreateReply("fakeOwner", "fakeRepoName", 1, comment));
-            comment.Body = body;
         }
     }
 
@@ -247,10 +276,7 @@ public class PullRequestReviewCommentsClientTests
             var connection = Substitute.For<IApiConnection>();
             var client = new PullRequestReviewCommentsClient(connection);
 
-            var comment = new PullRequestReviewCommentEdit
-            {
-                Body = "New comment content",
-            };
+            var comment = new PullRequestReviewCommentEdit("New comment content");
 
             client.Edit("fakeOwner", "fakeRepoName", 13, comment);
 
@@ -265,22 +291,13 @@ public class PullRequestReviewCommentsClientTests
 
             var body = "New comment content";
 
-            var comment = new PullRequestReviewCommentEdit
-            {
-                Body = body,
-            };
+            var comment = new PullRequestReviewCommentEdit(body);
 
             await AssertEx.Throws<ArgumentNullException>(async () => await client.Edit(null, "fakeRepoName", 1, comment));
             await AssertEx.Throws<ArgumentException>(async () => await client.Edit("", "fakeRepoName", 1, comment));
             await AssertEx.Throws<ArgumentNullException>(async () => await client.Edit("fakeOwner", null, 1, comment));
             await AssertEx.Throws<ArgumentException>(async () => await client.Edit("fakeOwner", "", 1, comment));
             await AssertEx.Throws<ArgumentNullException>(async () => await client.Edit("fakeOwner", null, 1, null));
-
-            comment.Body = null;
-            await AssertEx.Throws<ArgumentNullException>(async () => await client.Edit("fakeOwner", "fakeRepoName", 1, comment));
-            comment.Body = "";
-            await AssertEx.Throws<ArgumentException>(async () => await client.Edit("fakeOwner", "fakeRepoName", 1, comment));
-            comment.Body = body;
         }
     }
 
diff --git a/Octokit.Tests/Reactive/ObservablePullRequestReviewCommentsClientTests.cs b/Octokit.Tests/Reactive/ObservablePullRequestReviewCommentsClientTests.cs
index 6d1d3e98..dd47067e 100644
--- a/Octokit.Tests/Reactive/ObservablePullRequestReviewCommentsClientTests.cs
+++ b/Octokit.Tests/Reactive/ObservablePullRequestReviewCommentsClientTests.cs
@@ -276,13 +276,7 @@ namespace Octokit.Tests.Reactive
                 var gitHubClient = Substitute.For<IGitHubClient>();
                 var client = new ObservablePullRequestReviewCommentsClient(gitHubClient);
 
-                var comment = new PullRequestReviewCommentCreate
-                {
-                    Body = "Comment content",
-                    CommitId = "qe3dsdsf6",
-                    Path = "file.css",
-                    Position = 7,
-                };
+                var comment = new PullRequestReviewCommentCreate("Comment content", "qe3dsdsf6", "file.css", 7);
 
                 client.Create("fakeOwner", "fakeRepoName", 13, comment);
 
@@ -300,37 +294,13 @@ namespace Octokit.Tests.Reactive
                 string path = "file.css";
                 int position = 7;
 
-                var comment = new PullRequestReviewCommentCreate
-                {
-                    Body = body,
-                    CommitId = commitId,
-                    Path = path,
-                    Position = position,
-                };
+                var comment = new PullRequestReviewCommentCreate(body, commitId, path, position);
 
                 await AssertEx.Throws<ArgumentNullException>(async () => await client.Create(null, "name", 1, comment));
                 await AssertEx.Throws<ArgumentException>(async () => await client.Create("", "name", 1, comment));
                 await AssertEx.Throws<ArgumentNullException>(async () => await client.Create("owner", null, 1, comment));
                 await AssertEx.Throws<ArgumentException>(async () => await client.Create("owner", "", 1, comment));
                 await AssertEx.Throws<ArgumentNullException>(async () => await client.Create("owner", "name", 1, null));
-
-                comment.Body = null;
-                await AssertEx.Throws<ArgumentNullException>(async () => await client.Create("owner", "name", 1, comment));
-                comment.Body = "";
-                await AssertEx.Throws<ArgumentException>(async () => await client.Create("owner", "name", 1, comment));
-                comment.Body = body;
-
-                comment.CommitId = null;
-                await AssertEx.Throws<ArgumentNullException>(async () => await client.Create("owner", "name", 1, comment));
-                comment.CommitId = "";
-                await AssertEx.Throws<ArgumentException>(async () => await client.Create("owner", "name", 1, comment));
-                comment.CommitId = commitId;
-
-                comment.Path = null;
-                await AssertEx.Throws<ArgumentNullException>(async () => await client.Create("owner", "name", 1, comment));
-                comment.Path = "";
-                await AssertEx.Throws<ArgumentException>(async () => await client.Create("owner", "name", 1, comment));
-                comment.Path = path;
             }
         }
 
@@ -342,11 +312,7 @@ namespace Octokit.Tests.Reactive
                 var gitHubClient = Substitute.For<IGitHubClient>();
                 var client = new ObservablePullRequestReviewCommentsClient(gitHubClient);
 
-                var comment = new PullRequestReviewCommentReplyCreate
-                {
-                    Body = "Comment content",
-                    InReplyTo = 9,
-                };
+                var comment = new PullRequestReviewCommentReplyCreate("Comment content", 9);
 
                 client.CreateReply("fakeOwner", "fakeRepoName", 13, comment);
 
@@ -362,23 +328,13 @@ namespace Octokit.Tests.Reactive
                 string body = "Comment content";
                 int inReplyTo = 7;
 
-                var comment = new PullRequestReviewCommentReplyCreate
-                {
-                    Body = body,
-                    InReplyTo = inReplyTo,
-                };
+                var comment = new PullRequestReviewCommentReplyCreate(body, inReplyTo);
 
                 await AssertEx.Throws<ArgumentNullException>(async () => await client.CreateReply(null, "name", 1, comment));
                 await AssertEx.Throws<ArgumentException>(async () => await client.CreateReply("", "name", 1, comment));
                 await AssertEx.Throws<ArgumentNullException>(async () => await client.CreateReply("owner", null, 1, comment));
                 await AssertEx.Throws<ArgumentException>(async () => await client.CreateReply("owner", "", 1, comment));
                 await AssertEx.Throws<ArgumentNullException>(async () => await client.CreateReply("owner", "name", 1, null));
-
-                comment.Body = null;
-                await AssertEx.Throws<ArgumentNullException>(async () => await client.CreateReply("owner", "name", 1, comment));
-                comment.Body = "";
-                await AssertEx.Throws<ArgumentException>(async () => await client.CreateReply("owner", "name", 1, comment));
-                comment.Body = body;
             }
         }
 
@@ -390,10 +346,7 @@ namespace Octokit.Tests.Reactive
                 var gitHubClient = Substitute.For<IGitHubClient>();
                 var client = new ObservablePullRequestReviewCommentsClient(gitHubClient);
 
-                var comment = new PullRequestReviewCommentEdit
-                {
-                    Body = "New comment content",
-                };
+                var comment = new PullRequestReviewCommentEdit("New comment content");
 
                 client.Edit("fakeOwner", "fakeRepoName", 13, comment);
 
@@ -408,22 +361,13 @@ namespace Octokit.Tests.Reactive
 
                 var body = "New comment content";
 
-                var comment = new PullRequestReviewCommentEdit
-                {
-                    Body = body,
-                };
+                var comment = new PullRequestReviewCommentEdit(body);
 
                 await AssertEx.Throws<ArgumentNullException>(async () => await client.Edit(null, "name", 1, comment));
                 await AssertEx.Throws<ArgumentException>(async () => await client.Edit("", "name", 1, comment));
                 await AssertEx.Throws<ArgumentNullException>(async () => await client.Edit("owner", null, 1, comment));
                 await AssertEx.Throws<ArgumentException>(async () => await client.Edit("owner", "", 1, comment));
                 await AssertEx.Throws<ArgumentNullException>(async () => await client.Edit("owner", "name", 1, null));
-
-                comment.Body = null;
-                await AssertEx.Throws<ArgumentNullException>(async () => await client.Edit("owner", "name", 1, comment));
-                comment.Body = "";
-                await AssertEx.Throws<ArgumentException>(async () => await client.Edit("owner", "name", 1, comment));
-                comment.Body = body;
             }
         }
 
diff --git a/Octokit/Clients/PullRequestReviewCommentsClient.cs b/Octokit/Clients/PullRequestReviewCommentsClient.cs
index 0df5eb3a..280e5948 100644
--- a/Octokit/Clients/PullRequestReviewCommentsClient.cs
+++ b/Octokit/Clients/PullRequestReviewCommentsClient.cs
@@ -86,9 +86,6 @@ namespace Octokit
             Ensure.ArgumentNotNullOrEmptyString(owner, "owner");
             Ensure.ArgumentNotNullOrEmptyString(name, "name");
             Ensure.ArgumentNotNull(comment, "comment");
-            Ensure.ArgumentNotNullOrEmptyString(comment.Body, "body");
-            Ensure.ArgumentNotNullOrEmptyString(comment.CommitId, "commitId");
-            Ensure.ArgumentNotNullOrEmptyString(comment.Path, "path");
 
             var response = await ApiConnection.Connection.PostAsync<PullRequestReviewComment>(ApiUrls.PullRequestReviewComments(owner, name, number), comment, null, null).ConfigureAwait(false);
 
@@ -114,7 +111,6 @@ namespace Octokit
             Ensure.ArgumentNotNullOrEmptyString(owner, "owner");
             Ensure.ArgumentNotNullOrEmptyString(name, "name");
             Ensure.ArgumentNotNull(comment, "comment");
-            Ensure.ArgumentNotNullOrEmptyString(comment.Body, "body");
 
             var response = await ApiConnection.Connection.PostAsync<PullRequestReviewComment>(ApiUrls.PullRequestReviewComments(owner, name, number), comment, null, null).ConfigureAwait(false);
 
@@ -140,7 +136,6 @@ namespace Octokit
             Ensure.ArgumentNotNullOrEmptyString(owner, "owner");
             Ensure.ArgumentNotNullOrEmptyString(name, "name");
             Ensure.ArgumentNotNull(comment, "comment");
-            Ensure.ArgumentNotNullOrEmptyString(comment.Body, "body");
 
             return ApiConnection.Patch<PullRequestReviewComment>(ApiUrls.PullRequestReviewComment(owner, name, number), comment);
         }
diff --git a/Octokit/Models/Request/PullRequestReviewCommentCreate.cs b/Octokit/Models/Request/PullRequestReviewCommentCreate.cs
index 08e9e581..b3f96441 100644
--- a/Octokit/Models/Request/PullRequestReviewCommentCreate.cs
+++ b/Octokit/Models/Request/PullRequestReviewCommentCreate.cs
@@ -4,25 +4,48 @@ namespace Octokit
 {
     public class PullRequestReviewCommentCreate : RequestParameters
     {
+        private readonly string _body;
+        private readonly string _commitId;
+        private readonly string _path;
+        private readonly int _position;
+
         /// <summary>
         /// The text of the comment.
         /// </summary>
-        public string Body { get; set; }
+        public string Body { get { return _body; } }
 
         /// <summary>
         /// The SHA of the commit to comment on.
         /// </summary>
-        [Parameter(Key = "commit_id")]
-        public string CommitId { get; set; }
+        public string CommitId { get { return _commitId; } }
 
         /// <summary>
         /// The relative path of the file to comment on.
         /// </summary>
-        public string Path { get; set; }
+        public string Path { get { return _path; } }
 
         /// <summary>
         /// The line index in the diff to comment on.
         /// </summary>
-        public int Position { get; set; }
+        public int Position { get { return _position; } }
+
+        /// <summary>
+        /// Creates a comment
+        /// </summary>
+        /// <param name="body">The text of the comment</param>
+        /// <param name="commitId">The SHA of the commit to comment on</param>
+        /// <param name="path">The relative path of the file to comment on</param>
+        /// <param name="position">The line index in the diff to comment on</param>
+        public PullRequestReviewCommentCreate(string body, string commitId, string path, int position)
+        {
+            Ensure.ArgumentNotNullOrEmptyString(body, "body");
+            Ensure.ArgumentNotNullOrEmptyString(commitId, "commitId");
+            Ensure.ArgumentNotNullOrEmptyString(path, "path");
+
+            _body = body;
+            _commitId = commitId;
+            _path = path;
+            _position = position;
+        }
     }
 }
diff --git a/Octokit/Models/Request/PullRequestReviewCommentEdit.cs b/Octokit/Models/Request/PullRequestReviewCommentEdit.cs
index 1ad6f0ba..d257ebf1 100644
--- a/Octokit/Models/Request/PullRequestReviewCommentEdit.cs
+++ b/Octokit/Models/Request/PullRequestReviewCommentEdit.cs
@@ -3,9 +3,22 @@ namespace Octokit
 {
     public class PullRequestReviewCommentEdit : RequestParameters
     {
+        private readonly string _body;
+
         /// <summary>
         /// The text of the comment.
         /// </summary>
-        public string Body { get; set; }
+        public string Body { get { return _body; }}
+
+        /// <summary>
+        /// Creates an edit to a comment
+        /// </summary>
+        /// <param name="body">The text of the comment</param>
+        public PullRequestReviewCommentEdit(string body)
+        {
+            Ensure.ArgumentNotNullOrEmptyString(body, "body");
+
+            _body = body;
+        }
     }
 }
diff --git a/Octokit/Models/Request/PullRequestReviewCommentReplyCreate.cs b/Octokit/Models/Request/PullRequestReviewCommentReplyCreate.cs
index a8e23599..90822c01 100644
--- a/Octokit/Models/Request/PullRequestReviewCommentReplyCreate.cs
+++ b/Octokit/Models/Request/PullRequestReviewCommentReplyCreate.cs
@@ -4,15 +4,30 @@ namespace Octokit
 {
     public class PullRequestReviewCommentReplyCreate : RequestParameters
     {
+        private readonly string _body;
+        private readonly int _inReplyTo;
+
         /// <summary>
         /// The text of the comment.
         /// </summary>
-        public string Body { get; set; }
+        public string Body { get { return _body; } }
 
         /// <summary>
         /// The comment Id to reply to.
         /// </summary>
-        [Parameter(Key = "in_reply_to")]
-        public int InReplyTo { get; set; }
+        public int InReplyTo { get { return _inReplyTo; } }
+
+        /// <summary>
+        /// Creates a comment that is replying to another comment.
+        /// </summary>
+        /// <param name="body">The text of the comment</param>
+        /// <param name="inReplyTo">The comment Id to reply to</param>
+        public PullRequestReviewCommentReplyCreate(string body, int inReplyTo)
+        {
+            Ensure.ArgumentNotNullOrEmptyString(body, "body");
+
+            _body = body;
+            _inReplyTo = inReplyTo;
+        }
     }
 }
diff --git a/Octokit/Models/Request/PullRequestReviewCommentRequest.cs b/Octokit/Models/Request/PullRequestReviewCommentRequest.cs
index 125f8059..ada12064 100644
--- a/Octokit/Models/Request/PullRequestReviewCommentRequest.cs
+++ b/Octokit/Models/Request/PullRequestReviewCommentRequest.cs
@@ -7,7 +7,6 @@ namespace Octokit
         public PullRequestReviewCommentRequest()
         {
             // Default arguments
-
             Sort = PullRequestReviewCommentSort.Created;
             Direction = SortDirection.Ascending;
             Since = null;