diff --git a/Octokit.Reactive/Clients/IObservableCommitStatusClient.cs b/Octokit.Reactive/Clients/IObservableCommitStatusClient.cs
index b1a970fb..6a2efe16 100644
--- a/Octokit.Reactive/Clients/IObservableCommitStatusClient.cs
+++ b/Octokit.Reactive/Clients/IObservableCommitStatusClient.cs
@@ -2,6 +2,12 @@
 
 namespace Octokit.Reactive
 {
+    /// <summary>
+    /// A client for GitHub's Git Repository Status API.
+    /// </summary>
+    /// <remarks>
+    /// See the <a href="http://developer.github.com/v3/repos/statuses/">Repository Statuses API documentation</a> for more information.
+    /// </remarks>
     public interface IObservableCommitStatusClient
     {
         /// <summary>
@@ -12,7 +18,7 @@ namespace Octokit.Reactive
         /// <param name="owner">The owner of the repository</param>
         /// <param name="name">The name of the repository</param>
         /// <param name="reference">The reference (SHA, branch name, or tag name) to list commits for</param>
-        /// <returns></returns>
+        /// <returns>A <see cref="IObservable{CommitStatus}"/> of <see cref="CommitStatus"/>es representing commit statuses for specified repository</returns>
         IObservable<CommitStatus> GetAll(string owner, string name, string reference);
 
         /// <summary>
@@ -24,7 +30,7 @@ namespace Octokit.Reactive
         /// <param name="name">The name of the repository</param>        
         /// <param name="reference">The reference (SHA, branch name, or tag name) to list commits for</param>
         /// <param name="options">Options for changing the API response</param>
-        /// <returns></returns>
+        /// <returns>A <see cref="IObservable{CommitStatus}"/> of <see cref="CommitStatus"/>es representing commit statuses for specified repository</returns>
         IObservable<CommitStatus> GetAll(string owner, string name, string reference, ApiOptions options);
 
         /// <summary>
@@ -35,7 +41,7 @@ namespace Octokit.Reactive
         /// <param name="owner">The owner of the repository</param>
         /// <param name="name">The name of the repository</param>
         /// <param name="reference">The reference (SHA, branch name, or tag name) to list commits for</param>
-        /// <returns></returns>
+        /// <returns>A <see cref="IObservable{CombinedCommitStatus}"/> of <see cref="CombinedCommitStatus"/> representing combined commit status for specified repository</returns>
         IObservable<CombinedCommitStatus> GetCombined(string owner, string name, string reference);
 
         /// <summary>
@@ -44,8 +50,8 @@ namespace Octokit.Reactive
         /// <param name="owner">The owner of the repository</param>
         /// <param name="name">The name of the repository</param>
         /// <param name="reference">The reference (SHA, branch name, or tag name) to list commits for</param>
-        /// <param name="commitStatus">The commit status to create</param>
-        /// <returns></returns>
-        IObservable<CommitStatus> Create(string owner, string name, string reference, NewCommitStatus commitStatus);
+        /// <param name="newCommitStatus">The commit status to create</param>
+        /// <returns>A <see cref="IObservable{CommitStatus}"/> of <see cref="CommitStatus"/> representing created commit status for specified repository</returns>
+        IObservable<CommitStatus> Create(string owner, string name, string reference, NewCommitStatus newCommitStatus);
     }
 }
diff --git a/Octokit.Reactive/Clients/ObservableCommitStatusClient.cs b/Octokit.Reactive/Clients/ObservableCommitStatusClient.cs
index e34ed7a9..8d00f5f9 100644
--- a/Octokit.Reactive/Clients/ObservableCommitStatusClient.cs
+++ b/Octokit.Reactive/Clients/ObservableCommitStatusClient.cs
@@ -4,6 +4,12 @@ using Octokit.Reactive.Internal;
 
 namespace Octokit.Reactive
 {
+    /// <summary>
+    /// A client for GitHub's Git Repository Status API.
+    /// </summary>
+    /// <remarks>
+    /// See the <a href="http://developer.github.com/v3/repos/statuses/">Repository Statuses API documentation</a> for more information.
+    /// </remarks>
     public class ObservableCommitStatusClient : IObservableCommitStatusClient
     {
         readonly ICommitStatusClient _client;
@@ -25,7 +31,7 @@ namespace Octokit.Reactive
         /// <param name="owner">The owner of the repository</param>
         /// <param name="name">The name of the repository</param>
         /// <param name="reference">The reference (SHA, branch name, or tag name) to list commits for</param>
-        /// <returns></returns>
+        /// <returns>A <see cref="IObservable{CommitStatus}"/> of <see cref="CommitStatus"/>es representing commit statuses for specified repository</returns>
         public IObservable<CommitStatus> GetAll(string owner, string name, string reference)
         {
             Ensure.ArgumentNotNullOrEmptyString(owner, "owner");
@@ -44,7 +50,7 @@ namespace Octokit.Reactive
         /// <param name="name">The name of the repository</param>        
         /// <param name="reference">The reference (SHA, branch name, or tag name) to list commits for</param>
         /// <param name="options">Options for changing the API response</param>
-        /// <returns></returns>
+        /// <returns>A <see cref="IObservable{CommitStatus}"/> of <see cref="CommitStatus"/>es representing commit statuses for specified repository</returns>
         public IObservable<CommitStatus> GetAll(string owner, string name, string reference, ApiOptions options)
         {
             Ensure.ArgumentNotNullOrEmptyString(owner, "owner");
@@ -63,9 +69,13 @@ namespace Octokit.Reactive
         /// <param name="owner">The owner of the repository</param>
         /// <param name="name">The name of the repository</param>
         /// <param name="reference">The reference (SHA, branch name, or tag name) to list commits for</param>
-        /// <returns></returns>
+        /// <returns>A <see cref="IObservable{CombinedCommitStatus}"/> of <see cref="CombinedCommitStatus"/> representing combined commit status for specified repository</returns>
         public IObservable<CombinedCommitStatus> GetCombined(string owner, string name, string reference)
         {
+            Ensure.ArgumentNotNullOrEmptyString(owner, "owner");
+            Ensure.ArgumentNotNullOrEmptyString(name, "name");
+            Ensure.ArgumentNotNullOrEmptyString(reference, "reference");
+
             return _client.GetCombined(owner, name, reference).ToObservable();
         }
 
@@ -75,11 +85,16 @@ namespace Octokit.Reactive
         /// <param name="owner">The owner of the repository</param>
         /// <param name="name">The name of the repository</param>
         /// <param name="reference">The reference (SHA, branch name, or tag name) to list commits for</param>
-        /// <param name="commitStatus">The commit status to create</param>
-        /// <returns></returns>
-        public IObservable<CommitStatus> Create(string owner, string name, string reference, NewCommitStatus commitStatus)
+        /// <param name="newCommitStatus">The commit status to create</param>
+        /// <returns>A <see cref="IObservable{CommitStatus}"/> of <see cref="CommitStatus"/> representing created commit status for specified repository</returns>
+        public IObservable<CommitStatus> Create(string owner, string name, string reference, NewCommitStatus newCommitStatus)
         {
-            return _client.Create(owner, name, reference, commitStatus).ToObservable();
+            Ensure.ArgumentNotNullOrEmptyString(owner, "owner");
+            Ensure.ArgumentNotNullOrEmptyString(name, "name");
+            Ensure.ArgumentNotNullOrEmptyString(reference, "reference");
+            Ensure.ArgumentNotNull(newCommitStatus, "commitStatus");
+
+            return _client.Create(owner, name, reference, newCommitStatus).ToObservable();
         }
     }
 }
diff --git a/Octokit/Clients/CommitStatusClient.cs b/Octokit/Clients/CommitStatusClient.cs
index b890bdff..9c3acad3 100644
--- a/Octokit/Clients/CommitStatusClient.cs
+++ b/Octokit/Clients/CommitStatusClient.cs
@@ -29,7 +29,7 @@ namespace Octokit
         /// <param name="owner">The owner of the repository</param>
         /// <param name="name">The name of the repository</param>
         /// <param name="reference">The reference (SHA, branch name, or tag name) to list commits for</param>
-        /// <returns></returns>
+        /// <returns>A <see cref="IReadOnlyList{CommitStatus}"/> of <see cref="CommitStatus"/>es representing commit statuses for specified repository</returns>
         public Task<IReadOnlyList<CommitStatus>> GetAll(string owner, string name, string reference)
         {
             Ensure.ArgumentNotNullOrEmptyString(owner, "owner");
@@ -50,7 +50,7 @@ namespace Octokit
         /// <param name="name">The name of the repository</param>        
         /// <param name="reference">The reference (SHA, branch name, or tag name) to list commits for</param>
         /// <param name="options">Options for changing the API response</param>
-        /// <returns></returns>
+        /// <returns>A <see cref="IReadOnlyList{CommitStatus}"/> of <see cref="CommitStatus"/>es representing commit statuses for specified repository</returns>
         public Task<IReadOnlyList<CommitStatus>> GetAll(string owner, string name, string reference, ApiOptions options)
         {
             Ensure.ArgumentNotNullOrEmptyString(owner, "owner");
@@ -71,7 +71,7 @@ namespace Octokit
         /// <param name="owner">The owner of the repository</param>
         /// <param name="name">The name of the repository</param>
         /// <param name="reference">The reference (SHA, branch name, or tag name) to list commits for</param>
-        /// <returns></returns>
+        /// <returns>A <see cref="CombinedCommitStatus"/> representing combined commit status for specified repository</returns>
         public Task<CombinedCommitStatus> GetCombined(string owner, string name, string reference)
         {
             Ensure.ArgumentNotNullOrEmptyString(owner, "owner");
@@ -90,16 +90,16 @@ namespace Octokit
         /// <param name="owner">The owner of the repository</param>
         /// <param name="name">The name of the repository</param>
         /// <param name="reference">The reference (SHA, branch name, or tag name) to list commits for</param>
-        /// <param name="commitStatus">The commit status to create</param>
-        /// <returns></returns>
-        public Task<CommitStatus> Create(string owner, string name, string reference, NewCommitStatus commitStatus)
+        /// <param name="newCommitStatus">The commit status to create</param>
+        /// <returns>A <see cref="CommitStatus"/> representing created commit status for specified repository</returns>
+        public Task<CommitStatus> Create(string owner, string name, string reference, NewCommitStatus newCommitStatus)
         {
             Ensure.ArgumentNotNullOrEmptyString(owner, "owner");
             Ensure.ArgumentNotNullOrEmptyString(name, "name");
             Ensure.ArgumentNotNullOrEmptyString(reference, "reference");
-            Ensure.ArgumentNotNull(commitStatus, "commitStatus");
+            Ensure.ArgumentNotNull(newCommitStatus, "newCommitStatus");
 
-            return ApiConnection.Post<CommitStatus>(ApiUrls.CreateCommitStatus(owner, name, reference), commitStatus);
+            return ApiConnection.Post<CommitStatus>(ApiUrls.CreateCommitStatus(owner, name, reference), newCommitStatus);
         }
     }
 }
diff --git a/Octokit/Clients/ICommitStatusClient.cs b/Octokit/Clients/ICommitStatusClient.cs
index eb3c7209..980c7441 100644
--- a/Octokit/Clients/ICommitStatusClient.cs
+++ b/Octokit/Clients/ICommitStatusClient.cs
@@ -21,7 +21,7 @@ namespace Octokit
         /// <param name="owner">The owner of the repository</param>
         /// <param name="name">The name of the repository</param>
         /// <param name="reference">The reference (SHA, branch name, or tag name) to list commits for</param>
-        /// <returns></returns>
+        /// <returns>A <see cref="IReadOnlyList{CommitStatus}"/> of <see cref="CommitStatus"/>es representing commit statuses for specified repository</returns>
         Task<IReadOnlyList<CommitStatus>> GetAll(string owner, string name, string reference);
 
         /// <summary>
@@ -35,7 +35,7 @@ namespace Octokit
         /// <param name="name">The name of the repository</param>        
         /// <param name="reference">The reference (SHA, branch name, or tag name) to list commits for</param>
         /// <param name="options">Options for changing the API response</param>
-        /// <returns></returns>
+        /// <returns>A <see cref="IReadOnlyList{CommitStatus}"/> of <see cref="CommitStatus"/>es representing commit statuses for specified repository</returns>
         Task<IReadOnlyList<CommitStatus>> GetAll(string owner, string name, string reference, ApiOptions options);
 
         /// <summary>
@@ -48,7 +48,7 @@ namespace Octokit
         /// <param name="owner">The owner of the repository</param>
         /// <param name="name">The name of the repository</param>
         /// <param name="reference">The reference (SHA, branch name, or tag name) to list commits for</param>
-        /// <returns></returns>
+        /// <returns>A <see cref="CombinedCommitStatus"/> representing combined commit status for specified repository</returns>
         Task<CombinedCommitStatus> GetCombined(string owner, string name, string reference);
 
         /// <summary>
@@ -60,8 +60,8 @@ namespace Octokit
         /// <param name="owner">The owner of the repository</param>
         /// <param name="name">The name of the repository</param>
         /// <param name="reference">The reference (SHA, branch name, or tag name) to list commits for</param>
-        /// <param name="commitStatus">The commit status to create</param>
-        /// <returns></returns>
-        Task<CommitStatus> Create(string owner, string name, string reference, NewCommitStatus commitStatus);
+        /// <param name="newCommitStatus">The commit status to create</param>
+        /// <returns>A <see cref="CommitStatus"/> representing created commit status for specified repository</returns>
+        Task<CommitStatus> Create(string owner, string name, string reference, NewCommitStatus newCommitStatus);
     }
 }