diff -r 1a3c0122be7c -r 9503ad1d8ebb plugins/include/usermessages.inc
--- a/plugins/include/usermessages.inc	Wed May 02 02:13:15 2007 +0000
+++ b/plugins/include/usermessages.inc	Wed May 02 02:15:45 2007 +0000
@@ -26,10 +26,13 @@
 	INVALID_MESSAGE_ID = -1,
 };
 
-#define USERMSG_PASSTHRU		(1<<0)		/**< Message will pass through other SourceMM plugins */
-#define USERMSG_PASSTHRU_ALL	(1<<1)		/**< Message will pass through other SourceMM plugins AND SourceMod */
-#define USERMSG_RELIABLE		(1<<2)		/**< Message will be set to reliable */
+#define USERMSG_PASSTHRU		(1<<0)		/**< (DEPRECATED, NO EFFECT) */
+#define USERMSG_PASSTHRU_ALL	(1<<1)		/**< (DEPRECATED, NO EFFECT) */
+#define USERMSG_RELIABLE		(1<<2)		/**< Message will be set on the reliable stream */
 #define USERMSG_INITMSG			(1<<3)		/**< Message will be considered to be an initmsg */
+#define USERMSG_BLOCK_MM		(1<<4)		/**< Message will be blocked from going through MM:S hooks */
+#define USERMSG_BLOCK_SM		(1<<5)		/**< Message will be blocked from going through SourceMod hooks */
+#define USERMSG_BLOCK_ALL		(1<<6)		/**< Message will be blocked from going through any hooks */
 
 /**
  * Returns the ID of a given message, or -1 on failure.