diff --git a/src/mod_muc.erl b/src/mod_muc.erl
index e5baa37f2..8e9096337 100644
--- a/src/mod_muc.erl
+++ b/src/mod_muc.erl
@@ -600,6 +600,8 @@ iq_disco_info(ServerHost, Lang) ->
 	    attrs = [{<<"var">>, ?NS_REGISTER}], children = []},
      #xmlel{name = <<"feature">>,
 	    attrs = [{<<"var">>, ?NS_RSM}], children = []},
+     #xmlel{name = <<"feature">>,
+	    attrs = [{<<"var">>, ?NS_MUCSUB}], children = []},
      #xmlel{name = <<"feature">>,
 	    attrs = [{<<"var">>, ?NS_VCARD}], children = []}] ++
 	case gen_mod:is_loaded(ServerHost, mod_mam) of