diff --git a/Octokit.Reactive/Clients/IObservableTreesClient.cs b/Octokit.Reactive/Clients/IObservableTreesClient.cs
index ac10689a..696df956 100644
--- a/Octokit.Reactive/Clients/IObservableTreesClient.cs
+++ b/Octokit.Reactive/Clients/IObservableTreesClient.cs
@@ -2,6 +2,12 @@ using System;
 
 namespace Octokit.Reactive
 {
+    /// <summary>
+    /// A client for GitHub's Git Trees API.
+    /// </summary>
+    /// <remarks>
+    /// See the <a href="http://developer.github.com/v3/git/trees/">Git Trees API documentation</a> for more information.
+    /// </remarks>
     public interface IObservableTreesClient
     {
         /// <summary>
@@ -17,6 +23,18 @@ namespace Octokit.Reactive
         [System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Naming", "CA1716:IdentifiersShouldNotMatchKeywords", MessageId = "Get")]
         IObservable<TreeResponse> Get(string owner, string name, string reference);
 
+        /// <summary>
+        /// Gets a Tree Response for a given SHA.
+        /// </summary>
+        /// <remarks>
+        /// http://developer.github.com/v3/git/trees/#get-a-tree
+        /// </remarks>
+        /// <param name="repositoryId">The ID of the repository</param>
+        /// <param name="reference">The SHA that references the tree</param>
+        /// <returns>The <see cref="TreeResponse"/> for the specified Tree.</returns>
+        [System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Naming", "CA1716:IdentifiersShouldNotMatchKeywords", MessageId = "Get")]
+        IObservable<TreeResponse> Get(int repositoryId, string reference);
+
         /// <summary>
         /// Gets a Tree Response for a given SHA.
         /// </summary>
@@ -29,6 +47,17 @@ namespace Octokit.Reactive
         /// <returns>The <see cref="TreeResponse"/> for the specified Tree.</returns>
         IObservable<TreeResponse> GetRecursive(string owner, string name, string reference);
 
+        /// <summary>
+        /// Gets a Tree Response for a given SHA.
+        /// </summary>
+        /// <remarks>
+        /// https://developer.github.com/v3/git/trees/#get-a-tree-recursively
+        /// </remarks>
+        /// <param name="repositoryId">The ID of the repository</param>
+        /// <param name="reference">The SHA that references the tree</param>
+        /// <returns>The <see cref="TreeResponse"/> for the specified Tree.</returns>
+        IObservable<TreeResponse> GetRecursive(int repositoryId, string reference);
+
         /// <summary>
         /// Creates a new Tree in the specified repo
         /// </summary>
@@ -40,5 +69,16 @@ namespace Octokit.Reactive
         /// <param name="newTree">The value of the new tree</param>
         /// <returns>The <see cref="TreeResponse"/> that was just created.</returns>
         IObservable<TreeResponse> Create(string owner, string name, NewTree newTree);
+
+        /// <summary>
+        /// Creates a new Tree in the specified repo
+        /// </summary>
+        /// <remarks>
+        /// http://developer.github.com/v3/git/trees/#create-a-tree
+        /// </remarks>
+        /// <param name="repositoryId">The ID of the repository</param>
+        /// <param name="newTree">The value of the new tree</param>
+        /// <returns>The <see cref="TreeResponse"/> that was just created.</returns>
+        IObservable<TreeResponse> Create(int repositoryId, NewTree newTree);
     }
 }
\ No newline at end of file
diff --git a/Octokit.Reactive/Clients/ObservableTreesClient.cs b/Octokit.Reactive/Clients/ObservableTreesClient.cs
index e018b10d..bfe13b16 100644
--- a/Octokit.Reactive/Clients/ObservableTreesClient.cs
+++ b/Octokit.Reactive/Clients/ObservableTreesClient.cs
@@ -3,6 +3,12 @@ using System.Reactive.Threading.Tasks;
 
 namespace Octokit.Reactive
 {
+    /// <summary>
+    /// A client for GitHub's Git Trees API.
+    /// </summary>
+    /// <remarks>
+    /// See the <a href="http://developer.github.com/v3/git/trees/">Git Trees API documentation</a> for more information.
+    /// </remarks>
     public class ObservableTreesClient : IObservableTreesClient
     {
         readonly ITreesClient _client;
@@ -33,6 +39,22 @@ namespace Octokit.Reactive
             return _client.Get(owner, name, reference).ToObservable();
         }
 
+        /// <summary>
+        /// Gets a Tree Response for a given SHA.
+        /// </summary>
+        /// <remarks>
+        /// http://developer.github.com/v3/git/trees/#get-a-tree
+        /// </remarks>
+        /// <param name="repositoryId">The ID of the repository</param>
+        /// <param name="reference">The SHA that references the tree</param>
+        /// <returns>The <see cref="TreeResponse"/> for the specified Tree.</returns>
+        public IObservable<TreeResponse> Get(int repositoryId, string reference)
+        {
+            Ensure.ArgumentNotNullOrEmptyString(reference, "reference");
+
+            return _client.Get(repositoryId, reference).ToObservable();
+        }
+
         /// <summary>
         /// Gets a Tree Response for a given SHA.
         /// </summary>
@@ -52,6 +74,22 @@ namespace Octokit.Reactive
             return _client.GetRecursive(owner, name, reference).ToObservable();
         }
 
+        /// <summary>
+        /// Gets a Tree Response for a given SHA.
+        /// </summary>
+        /// <remarks>
+        /// https://developer.github.com/v3/git/trees/#get-a-tree-recursively
+        /// </remarks>
+        /// <param name="repositoryId">The ID of the repository</param>
+        /// <param name="reference">The SHA that references the tree</param>
+        /// <returns>The <see cref="TreeResponse"/> for the specified Tree.</returns>
+        public IObservable<TreeResponse> GetRecursive(int repositoryId, string reference)
+        {
+            Ensure.ArgumentNotNullOrEmptyString(reference, "reference");
+
+            return _client.GetRecursive(repositoryId, reference).ToObservable();
+        }
+
         /// <summary>
         /// Creates a new Tree in the specified repo
         /// </summary>
@@ -70,5 +108,21 @@ namespace Octokit.Reactive
 
             return _client.Create(owner, name, newTree).ToObservable();
         }
+
+        /// <summary>
+        /// Creates a new Tree in the specified repo
+        /// </summary>
+        /// <remarks>
+        /// http://developer.github.com/v3/git/trees/#create-a-tree
+        /// </remarks>
+        /// <param name="repositoryId">The ID of the repository</param>
+        /// <param name="newTree">The value of the new tree</param>
+        /// <returns>The <see cref="TreeResponse"/> that was just created.</returns>
+        public IObservable<TreeResponse> Create(int repositoryId, NewTree newTree)
+        {
+            Ensure.ArgumentNotNull(newTree, "newTree");
+
+            return _client.Create(repositoryId, newTree).ToObservable();
+        }
     }
 }
diff --git a/Octokit/Clients/ITreesClient.cs b/Octokit/Clients/ITreesClient.cs
index 549621a4..fe74e1eb 100644
--- a/Octokit/Clients/ITreesClient.cs
+++ b/Octokit/Clients/ITreesClient.cs
@@ -23,6 +23,18 @@ namespace Octokit
         [System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Naming", "CA1716:IdentifiersShouldNotMatchKeywords", MessageId = "Get")]
         Task<TreeResponse> Get(string owner, string name, string reference);
 
+        /// <summary>
+        /// Gets a Tree Response for a given SHA.
+        /// </summary>
+        /// <remarks>
+        /// http://developer.github.com/v3/git/trees/#get-a-tree
+        /// </remarks>
+        /// <param name="repositoryId">The ID of the repository</param>
+        /// <param name="reference">The SHA that references the tree</param>
+        /// <returns>The <see cref="TreeResponse"/> for the specified Tree.</returns>
+        [System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Naming", "CA1716:IdentifiersShouldNotMatchKeywords", MessageId = "Get")]
+        Task<TreeResponse> Get(int repositoryId, string reference);
+
         /// <summary>
         /// Gets a Tree Response for a given SHA.
         /// </summary>
@@ -35,6 +47,17 @@ namespace Octokit
         /// <returns>The <see cref="TreeResponse"/> for the specified Tree.</returns>
         Task<TreeResponse> GetRecursive(string owner, string name, string reference);
 
+        /// <summary>
+        /// Gets a Tree Response for a given SHA.
+        /// </summary>
+        /// <remarks>
+        /// https://developer.github.com/v3/git/trees/#get-a-tree-recursively
+        /// </remarks>
+        /// <param name="repositoryId">The ID of the repository</param>
+        /// <param name="reference">The SHA that references the tree</param>
+        /// <returns>The <see cref="TreeResponse"/> for the specified Tree.</returns>
+        Task<TreeResponse> GetRecursive(int repositoryId, string reference);
+
         /// <summary>
         /// Creates a new Tree in the specified repo
         /// </summary>
@@ -46,5 +69,16 @@ namespace Octokit
         /// <param name="newTree">The value of the new tree</param>
         /// <returns>The <see cref="TreeResponse"/> that was just created.</returns>
         Task<TreeResponse> Create(string owner, string name, NewTree newTree);
+
+        /// <summary>
+        /// Creates a new Tree in the specified repo
+        /// </summary>
+        /// <remarks>
+        /// http://developer.github.com/v3/git/trees/#create-a-tree
+        /// </remarks>
+        /// <param name="repositoryId">The ID of the repository</param>
+        /// <param name="newTree">The value of the new tree</param>
+        /// <returns>The <see cref="TreeResponse"/> that was just created.</returns>
+        Task<TreeResponse> Create(int repositoryId, NewTree newTree);
     }
 }
\ No newline at end of file
diff --git a/Octokit/Clients/TreesClient.cs b/Octokit/Clients/TreesClient.cs
index 5ac64675..829014c6 100644
--- a/Octokit/Clients/TreesClient.cs
+++ b/Octokit/Clients/TreesClient.cs
@@ -40,6 +40,22 @@ namespace Octokit
             return ApiConnection.Get<TreeResponse>(ApiUrls.Tree(owner, name, reference));
         }
 
+        /// <summary>
+        /// Gets a Tree Response for a given SHA.
+        /// </summary>
+        /// <remarks>
+        /// http://developer.github.com/v3/git/trees/#get-a-tree
+        /// </remarks>
+        /// <param name="repositoryId">The ID of the repository</param>
+        /// <param name="reference">The SHA that references the tree</param>
+        /// <returns>The <see cref="TreeResponse"/> for the specified Tree.</returns>
+        public Task<TreeResponse> Get(int repositoryId, string reference)
+        {
+            Ensure.ArgumentNotNullOrEmptyString(reference, "reference");
+
+            return ApiConnection.Get<TreeResponse>(ApiUrls.Tree(repositoryId, reference));
+        }
+
         /// <summary>
         /// Gets a Tree Response for a given SHA.
         /// </summary>
@@ -59,6 +75,22 @@ namespace Octokit
             return ApiConnection.Get<TreeResponse>(ApiUrls.TreeRecursive(owner, name, reference));
         }
 
+        /// <summary>
+        /// Gets a Tree Response for a given SHA.
+        /// </summary>
+        /// <remarks>
+        /// https://developer.github.com/v3/git/trees/#get-a-tree-recursively
+        /// </remarks>
+        /// <param name="repositoryId">The ID of the repository</param>
+        /// <param name="reference">The SHA that references the tree</param>
+        /// <returns>The <see cref="TreeResponse"/> for the specified Tree.</returns>
+        public Task<TreeResponse> GetRecursive(int repositoryId, string reference)
+        {
+            Ensure.ArgumentNotNullOrEmptyString(reference, "reference");
+
+            return ApiConnection.Get<TreeResponse>(ApiUrls.TreeRecursive(repositoryId, reference));
+        }
+
         /// <summary>
         /// Creates a new Tree in the specified repo
         /// </summary>
@@ -82,5 +114,26 @@ namespace Octokit
 
             return ApiConnection.Post<TreeResponse>(ApiUrls.Tree(owner, name), newTree);
         }
+
+        /// <summary>
+        /// Creates a new Tree in the specified repo
+        /// </summary>
+        /// <remarks>
+        /// http://developer.github.com/v3/git/trees/#create-a-tree
+        /// </remarks>
+        /// <param name="repositoryId">The ID of the repository</param>
+        /// <param name="newTree">The value of the new tree</param>
+        /// <returns>The <see cref="TreeResponse"/> that was just created.</returns>
+        public Task<TreeResponse> Create(int repositoryId, NewTree newTree)
+        {
+            Ensure.ArgumentNotNull(newTree, "newTree");
+
+            if (newTree.Tree.Any(t => string.IsNullOrWhiteSpace(t.Mode)))
+            {
+                throw new ArgumentException("You have specified items in the tree which do not have a Mode value set.");
+            }
+
+            return ApiConnection.Post<TreeResponse>(ApiUrls.Tree(repositoryId), newTree);
+        }
     }
 }