diff --git a/Octokit.Reactive/Clients/IObservableTeamsClient.cs b/Octokit.Reactive/Clients/IObservableTeamsClient.cs
index 0ca0a385..7acad621 100644
--- a/Octokit.Reactive/Clients/IObservableTeamsClient.cs
+++ b/Octokit.Reactive/Clients/IObservableTeamsClient.cs
@@ -171,6 +171,20 @@ namespace Octokit.Reactive
         /// <returns><see langword="true"/> if the repository was added to the team; <see langword="false"/> otherwise.</returns>
         IObservable<bool> AddRepository(int id, string organization, string repoName);
 
+        /// <summary>
+        /// Adds a <see cref="Repository"/> to a <see cref="Team"/>.
+        /// </summary>
+        /// <param name="id">The team identifier.</param>
+        /// <param name="organization">Org to associate the repo with.</param>
+        /// <param name="repoName">Name of the repo.</param>
+        /// <param name="permission">The permission to grant the team on this repository.</param>
+        /// <exception cref="ApiValidationException">Thrown if you attempt to add a repository to a team that is not owned by the organization.</exception>
+        /// <remarks>
+        /// See the <a href="https://developer.github.com/v3/orgs/teams/#add-team-repo">API documentation</a> for more information.
+        /// </remarks>
+        /// <returns><see langword="true"/> if the repository was added to the team; <see langword="false"/> otherwise.</returns>
+        IObservable<bool> AddRepository(int id, string organization, string repoName, TeamRepositoryUpdate permission);
+
         /// <summary>
         /// Gets whether or not the given repository is managed by the given team.
         /// </summary>
diff --git a/Octokit.Reactive/Clients/ObservableTeamsClient.cs b/Octokit.Reactive/Clients/ObservableTeamsClient.cs
index 31f9b7aa..1649472b 100644
--- a/Octokit.Reactive/Clients/ObservableTeamsClient.cs
+++ b/Octokit.Reactive/Clients/ObservableTeamsClient.cs
@@ -246,6 +246,25 @@ namespace Octokit.Reactive
             return _client.AddRepository(id, organization, repoName).ToObservable();
         }
 
+        /// <summary>
+        /// Adds a <see cref="Repository"/> to a <see cref="Team"/>.
+        /// </summary>
+        /// <param name="id">The team identifier.</param>
+        /// <param name="organization">Org to associate the repo with.</param>
+        /// <param name="repoName">Name of the repo.</param>
+        /// <param name="permission">The permission to grant the team on this repository.</param>
+        /// <exception cref="ApiValidationException">Thrown if you attempt to add a repository to a team that is not owned by the organization.</exception>
+        /// <remarks>
+        /// See the <a href="https://developer.github.com/v3/orgs/teams/#add-team-repo">API documentation</a> for more information.
+        /// </remarks>
+        /// <returns><see langword="true"/> if the repository was added to the team; <see langword="false"/> otherwise.</returns>
+        public IObservable<bool> AddRepository(int id, string organization, string repoName, TeamRepositoryUpdate permission)
+        {
+            Ensure.ArgumentNotNullOrEmptyString(organization, "organization");
+            Ensure.ArgumentNotNullOrEmptyString(repoName, "repoName");
+
+            return _client.AddRepository(id, organization, repoName, permission).ToObservable();
+        }
 
         /// <summary>
         /// Remove a repository from the team
diff --git a/Octokit/Clients/ITeamsClient.cs b/Octokit/Clients/ITeamsClient.cs
index e4699ce9..1925dba9 100644
--- a/Octokit/Clients/ITeamsClient.cs
+++ b/Octokit/Clients/ITeamsClient.cs
@@ -162,10 +162,10 @@ namespace Octokit
         /// <summary>
         /// Add a repository to the team
         /// </summary>
-        /// <param name="permission">The permission to grant the team on this repository</param>
+        /// <param name="permission">The permission to grant the team on this repository.</param>
         /// <exception cref="ApiException">Thrown when a general API error occurs.</exception>
         /// <returns></returns>
-        Task<bool> AddRepository(int id, string organization, string repoName, PermissionType permission);
+        Task<bool> AddRepository(int id, string organization, string repoName, TeamRepositoryUpdate permission);
 
         /// <summary>
         /// Remove a repository from the team
diff --git a/Octokit/Clients/TeamsClient.cs b/Octokit/Clients/TeamsClient.cs
index cc267bc3..5e244336 100644
--- a/Octokit/Clients/TeamsClient.cs
+++ b/Octokit/Clients/TeamsClient.cs
@@ -317,7 +317,13 @@ namespace Octokit
             }
         }
 
-        public async Task<bool> AddRepository(int id, string organization, string repoName, PermissionType permission)
+        /// <summary>
+        /// Add a repository to the team
+        /// </summary>
+        /// <param name="permission">The permission to grant the team on this repository.</param>
+        /// <exception cref="ApiException">Thrown when a general API error occurs.</exception>
+        /// <returns></returns>
+        public async Task<bool> AddRepository(int id, string organization, string repoName, TeamRepositoryUpdate permission)
         {
             Ensure.ArgumentNotNullOrEmptyString(organization, "organization");
             Ensure.ArgumentNotNullOrEmptyString(repoName, "repoName");
@@ -326,7 +332,7 @@ namespace Octokit
 
             try
             {
-                var httpStatusCode = await ApiConnection.Connection.Put(endpoint).ConfigureAwait(false);
+                var httpStatusCode = await ApiConnection.Connection.Put(endpoint, permission).ConfigureAwait(false);
                 return httpStatusCode == HttpStatusCode.NoContent;
             }
             catch (NotFoundException)
diff --git a/Octokit/Http/Connection.cs b/Octokit/Http/Connection.cs
index 8f7412e1..229849f7 100644
--- a/Octokit/Http/Connection.cs
+++ b/Octokit/Http/Connection.cs
@@ -404,6 +404,21 @@ namespace Octokit
             return response.HttpResponse.StatusCode;
         }
 
+        /// <summary>
+        /// Performs an asynchronous HTTP PUT request that expects an empty response.
+        /// </summary>
+        /// <param name="uri">URI endpoint to send request to</param>
+        /// <param name="body">The object to serialize as the body of the request</param>
+        /// <returns>The returned <seealso cref="HttpStatusCode"/></returns>
+        public async Task<HttpStatusCode> Put(Uri uri, object body)
+        {
+            Ensure.ArgumentNotNull(uri, "uri");
+            Ensure.ArgumentNotNull(body, "body");
+
+            var response = await SendData<object>(uri, HttpMethod.Put, body, null, null, CancellationToken.None).ConfigureAwait(false);
+            return response.HttpResponse.StatusCode;
+        }
+
         /// <summary>
         /// Performs an asynchronous HTTP DELETE request that expects an empty response.
         /// </summary>
@@ -466,7 +481,7 @@ namespace Octokit
         /// <param name="data">The object to serialize as the body of the request</param>
         /// <param name="accepts">Specifies accept response media type</param>
         /// <returns>The returned <seealso cref="HttpStatusCode"/></returns>
-        public async Task<HttpStatusCode> Delete(Uri uri,object data, string accepts)
+        public async Task<HttpStatusCode> Delete(Uri uri, object data, string accepts)
         {
             Ensure.ArgumentNotNull(uri, "uri");
             Ensure.ArgumentNotNull(accepts, "accepts");
diff --git a/Octokit/Http/IConnection.cs b/Octokit/Http/IConnection.cs
index 39ddac53..d89c22c3 100644
--- a/Octokit/Http/IConnection.cs
+++ b/Octokit/Http/IConnection.cs
@@ -197,6 +197,14 @@ namespace Octokit
         /// <returns>The returned <seealso cref="HttpStatusCode"/></returns>
         Task<HttpStatusCode> Put(Uri uri);
 
+        /// <summary>
+        /// Performs an asynchronous HTTP PUT request that expects an empty response.
+        /// </summary>
+        /// <param name="uri">URI endpoint to send request to</param>
+        /// <param name="body">The object to serialize as the body of the request</param>
+        /// <returns>The returned <seealso cref="HttpStatusCode"/></returns>
+        Task<HttpStatusCode> Put(Uri uri, object body);
+
         /// <summary>
         /// Performs an asynchronous HTTP DELETE request that expects an empty response.
         /// </summary>
diff --git a/Octokit/Models/Request/TeamRepositoryUpdate.cs b/Octokit/Models/Request/TeamRepositoryUpdate.cs
index 1106572f..e5a64b6f 100644
--- a/Octokit/Models/Request/TeamRepositoryUpdate.cs
+++ b/Octokit/Models/Request/TeamRepositoryUpdate.cs
@@ -35,7 +35,7 @@ namespace Octokit
         {
             get
             {
-                return string.Format(CultureInfo.InvariantCulture, "Permission: {}", Permission);
+                return string.Format(CultureInfo.InvariantCulture, "Permission: {0}", Permission);
             }
         }
     }