diff --git a/src/mod_muc_room.erl b/src/mod_muc_room.erl
index 3f2c655df..a94b7be07 100644
--- a/src/mod_muc_room.erl
+++ b/src/mod_muc_room.erl
@@ -27,6 +27,8 @@
 
 -author('alexey@process-one.net').
 
+-protocol({xep, 317, '0.1'}).
+
 -behaviour(p1_fsm).
 
 %% External exports