diff --git a/public/IUserMessages.h b/public/IUserMessages.h
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+/**
+ * vim: set ts=4 :
+ * ===============================================================
+ * SourceMod, Copyright (C) 2004-2007 AlliedModders LLC. 
+ * All rights reserved.
+ * ===============================================================
+ *
+ *  This file is part of the SourceMod/SourcePawn SDK.  This file may only be 
+ * used or modified under the Terms and Conditions of its License Agreement, 
+ * which is found in public/licenses/LICENSE.txt.  As of this notice, derivative 
+ * works must be licensed under the GNU General Public License (version 2 or 
+ * greater).  A copy of the GPL is included under public/licenses/GPL.txt.
+ * 
+ * To view the latest information, see: http://www.sourcemod.net/license.php
+ *
+ * Version: $Id$
+ */
+
+#ifndef _INCLUDE_SOURCEMOD_INTERFACE_USERMESSAGES_H_
+#define _INCLUDE_SOURCEMOD_INTERFACE_USERMESSAGES_H_
+
+#include <sp_vm_api.h>
+#include <bitbuf.h>
+#include <irecipientfilter.h>
+
+/**
+ * @file IUserMessages.h
+ * @brief Contains functions for advanced usermessage hooking.
+ */
+
+#define SMINTERFACE_USERMSGS_NAME		"IUserMessages"
+#define SMINTERFACE_USERMSGS_VERSION	1
+
+namespace SourceMod
+{
+	/**
+	 * @brief Listens to user messages sent from the server.
+	 */
+	class IUserMessageListener
+	{
+	public:
+		/**
+		 * @brief Called when a hooked user message is being sent 
+		 * and all interceptions have finished.
+		 *
+		 * @param msg_id		Message Id.
+		 * @param bf			bf_write structure containing written bytes.
+		 * @param pFilter		Recipient filter.
+		 */
+		virtual void OnUserMessage(int msg_id, bf_write *bf, IRecipientFilter *pFilter)
+		{
+		}
+
+		/**
+		 * @brief Called when a hooked user message is intercepted.
+		 * 
+		 * @param msg_id		Message Id.
+		 * @param bf			bf_write structure containing written bytes.
+		 * @param pFtiler		Recipient filter.
+		 * @return				True to allow message, false to scrap it.
+		 */
+		virtual bool InterceptUserMessage(int msg_id, bf_write *bf, IRecipientFilter *pFilter)
+		{
+			return true;
+		}
+
+		/**
+		 * @brief Called when a hooked user message is sent, regardless of the hook type.
+		 * @param mgs_id		Message Id.
+		 */
+		virtual void OnUserMessageSent(int msg_id)
+		{
+		}
+	};
+
+	/**
+	 * @brief Contains functions for hooking user messages.
+	 */
+	class IUserMessages : public SMInterface
+	{
+	public:
+		virtual unsigned int GetInterfaceVersion()
+		{
+			return SMINTERFACE_USERMSGS_VERSION;
+		}
+		virtual const char *GetInterfaceName()
+		{
+			return SMINTERFACE_USERMSGS_NAME;
+		}
+	public:
+		/**
+		 * @brief Finds a message id by name.
+		 * 
+		 * Note: due to a bug in Valve's earlier SDK versions, this
+		 * may cause crashes alongside IServerGameDLL003 if the message is
+		 * not found.
+		 *
+		 * @param msg		Case-sensitive string containing the message.
+		 * @return			A message index, or -1 on failure.
+		 */
+		virtual int GetMessageIndex(const char *msg) =0;
+
+		/**
+		 * @brief Sets a hook on a user message.
+		 *
+		 * @param msg_id		Message Id.
+		 * @param pListener		Pointer to an IUserMessageListener.
+		 * @param intercept		If true, message will be intercepted rather than merely hooked.
+		 * @return				True on success, false otherwise.
+		 */
+		virtual bool HookUserMessage(int msg_id, IUserMessageListener *pListener, bool intercept=false) =0;
+
+		/**
+		 * @brief Wrapper around UserMessageBegin for more options.
+		 * 
+		 * @param mgs_id		Message Id.
+		 * @param players		Array containing player indexes.
+		 * @param playersNum	Number of players in the array.
+		 * @param flags			Flags to use for sending the message.
+		 * @return				bf_write structure to write message with.
+		 */
+		virtual bf_write *StartMessage(int msg_id, cell_t players[], unsigned int playersNum, int flags) =0;
+
+		/**
+		 * @brief Wrapper around UserMessageEnd for use with StartMessage().
+		 */
+		virtual void EndMessage() =0;
+	};
+}
+
+#endif //_INCLUDE_SOURCEMOD_INTERFACE_USERMESSAGES_H_