1 files changed, 16 insertions, 0 deletions
diff --git a/src/DotNetOpenAuth.Core/Messaging/IExtensionMessage.cs b/src/DotNetOpenAuth.Core/Messaging/IExtensionMessage.cs
new file mode 100644
index 0000000..5fc05a6
--- /dev/null
+++ b/src/DotNetOpenAuth.Core/Messaging/IExtensionMessage.cs
@@ -0,0 +1,16 @@
+//-----------------------------------------------------------------------
+// <copyright file="IExtensionMessage.cs" company="Andrew Arnott">
+//     Copyright (c) Andrew Arnott. All rights reserved.
+// </copyright>
+//-----------------------------------------------------------------------
+
+namespace DotNetOpenAuth.Messaging {
+	using System.Diagnostics.CodeAnalysis;
+
+	/// <summary>
+	/// An interface that extension messages must implement.
+	/// </summary>
+	[SuppressMessage("Microsoft.Design", "CA1040:AvoidEmptyInterfaces", Justification = "Extension messages may gain members later on.")]
+	public interface IExtensionMessage : IMessage {
+	}
+}