diff --git a/cg/cg0500a.uml b/cg/cg0500a.uml
index 977f162e1..76d889937 100755
--- a/cg/cg0500a.uml
+++ b/cg/cg0500a.uml
@@ -65,6 +65,7 @@ BEGIN
 //  MESSAGE SHOW, 2@
 //  MESSAGE EMPTY HIDE, 2@
   FLAGS "U"
+  ADD NONE
 END
 
 STRING F_COD_REG 3