diff --git a/projects/client/RabbitMQ.Client/src/client/api/IBasicProperties.cs b/projects/client/RabbitMQ.Client/src/client/api/IBasicProperties.cs
index 054ed3f7e5..6ebed5d3fa 100644
--- a/projects/client/RabbitMQ.Client/src/client/api/IBasicProperties.cs
+++ b/projects/client/RabbitMQ.Client/src/client/api/IBasicProperties.cs
@@ -101,7 +101,9 @@ public interface IBasicProperties : IContentHeader
         ///<summary> creating application id </summary>
         string AppId { get; set; }
 
-        ///<summary> intra-cluster routing identifier </summary>
+        ///<summary> intra-cluster routing identifier 
+        /// (cluster id is deprecated in AMQP 0-9-1)
+        ///</summary>
         string ClusterId { get; set; }
 
         ///<summary> Clear the ContentType property. </summary>
@@ -143,7 +145,9 @@ public interface IBasicProperties : IContentHeader
         ///<summary> Clear the AppId property. </summary>
         void ClearAppId();
 
-        ///<summary> Clear the ClusterId property. </summary>
+        ///<summary> Clear the ClusterId property.
+        /// (cluster id is deprecated in AMQP 0-9-1)
+        ///</summary>
         void ClearClusterId();
 
         ///<summary> Returns true iff the ContentType property is present. </summary>
@@ -185,7 +189,9 @@ public interface IBasicProperties : IContentHeader
         ///<summary> Returns true iff the AppId property is present. </summary>
         bool IsAppIdPresent();
 
-        ///<summary> Returns true iff the ClusterId property is present. </summary>
+        ///<summary> Returns true iff the ClusterId property is present. 
+        /// (cluster id is deprecated in AMQP 0-9-1)
+        ///</summary>
         bool IsClusterIdPresent();
 
         ///<summary>Convenience property; parses ReplyTo property
diff --git a/projects/client/RabbitMQ.Client/src/client/api/IModel.cs b/projects/client/RabbitMQ.Client/src/client/api/IModel.cs
index cc149afcbe..a9af1b95ad 100644
--- a/projects/client/RabbitMQ.Client/src/client/api/IModel.cs
+++ b/projects/client/RabbitMQ.Client/src/client/api/IModel.cs
@@ -141,13 +141,15 @@ public interface IModel: IDisposable
         IBasicProperties CreateBasicProperties();
 
         ///<summary>Construct a completely empty content header for
-        ///use with the File content class.</summary>
+        ///use with the File content class.
+        /// (unsupported in AMQP 0-9-1)</summary>
         [AmqpContentHeaderFactory("file")]
         [AmqpUnsupported("RabbitMQ.Client.Framing.v0_9_1")]
         IFileProperties CreateFileProperties();
 
         ///<summary>Construct a completely empty content header for
-        ///use with the Stream content class.</summary>
+        ///use with the Stream content class.
+        /// (unsupported in AMQP 0-9-1)</summary>
         [AmqpContentHeaderFactory("stream")]
         [AmqpUnsupported("RabbitMQ.Client.Framing.v0_9_1")]
         IStreamProperties CreateStreamProperties();
@@ -441,11 +443,12 @@ BasicGetResult BasicGet(string queue,
         ///transaction.</summary>
         void TxRollback();
 
-        ///<summary>(Spec method) Enable DTX mode for this session.</summary>
+        ///<summary>(Spec method) Enable DTX mode for this session.
+        /// (unsupported in AMQP 0-9-1)</summary>
         [AmqpUnsupported("RabbitMQ.Client.Framing.v0_9_1")]
         void DtxSelect();
 
-        ///<summary>(Spec method)</summary>
+        ///<summary>(Spec method, unsupported in AMQP 0-9-1)</summary>
         [AmqpUnsupported("RabbitMQ.Client.Framing.v0_9_1")]
         void DtxStart(string dtxIdentifier);
 
@@ -908,7 +911,9 @@ void _Private_ConnectionOpen(string virtualHost,
         void HandleConnectionOpenOk([AmqpFieldMapping("RabbitMQ.Client.Framing.v0_9_1", "reserved1")]
                                     string knownHosts);
 
-        ///<summary>Handle an incoming Connection.Redirect.</summary>
+        ///<summary>Handle an incoming Connection.Redirect.
+        /// (not available in AMQP 0-9-1)
+        ///</summary>
         [AmqpMethodDoNotImplement("RabbitMQ.Client.Framing.v0_9_1")]
         void HandleConnectionRedirect(string host,
                                       string knownHosts);