diff --git a/prolog/metta_lang/stdlib_mettalog.metta b/prolog/metta_lang/stdlib_mettalog.metta
index 7521e80430..3bfb94a1a9 100644
--- a/prolog/metta_lang/stdlib_mettalog.metta
+++ b/prolog/metta_lang/stdlib_mettalog.metta
@@ -329,7 +329,9 @@ For example:
   (@params (
     (@param "Value to be returned")))
   (@return "Passed argument"))
-(: return (-> $t $t))
+; probably should be (: return (-> $t $t)) 
+(: return (-> Atom Atom))
+
 
 (iz function MinimalMeTTa)
 (@doc function