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diff --git a/src/DotNetOpenAuth.Core/Messaging/IDirectedProtocolMessage.cs b/src/DotNetOpenAuth.Core/Messaging/IDirectedProtocolMessage.cs
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+++ b/src/DotNetOpenAuth.Core/Messaging/IDirectedProtocolMessage.cs
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+//-----------------------------------------------------------------------
+// <copyright file="IDirectedProtocolMessage.cs" company="Andrew Arnott">
+//     Copyright (c) Andrew Arnott. All rights reserved.
+// </copyright>
+//-----------------------------------------------------------------------
+
+namespace DotNetOpenAuth.Messaging {
+	using System;
+
+	/// <summary>
+	/// Implemented by messages that have explicit recipients
+	/// (direct requests and all indirect messages).
+	/// </summary>
+	public interface IDirectedProtocolMessage : IProtocolMessage {
+		/// <summary>
+		/// Gets the preferred method of transport for the message.
+		/// </summary>
+		/// <remarks>
+		/// For indirect messages this will likely be GET+POST, which both can be simulated in the user agent:
+		/// the GET with a simple 301 Redirect, and the POST with an HTML form in the response with javascript
+		/// to automate submission.
+		/// </remarks>
+		HttpDeliveryMethods HttpMethods { get; }
+
+		/// <summary>
+		/// Gets the URL of the intended receiver of this message.
+		/// </summary>
+		Uri Recipient { get; }
+	}
+}