diff --git a/src/backend/catalog/aclchk.c b/src/backend/catalog/aclchk.c
index 1dc0f2d5ac6..a585c3ad19a 100644
--- a/src/backend/catalog/aclchk.c
+++ b/src/backend/catalog/aclchk.c
@@ -2592,7 +2592,8 @@ ExecGrant_Language(InternalGrant *istmt)
 					(errcode(ERRCODE_WRONG_OBJECT_TYPE),
 					 errmsg("language \"%s\" is not trusted",
 							NameStr(pg_language_tuple->lanname)),
-				   errhint("Only superusers can use untrusted languages.")));
+					 errdetail("GRANT and REVOKE are not allowed on untrusted languages, "
+				   "because only superusers can use untrusted languages.")));
 
 		/*
 		 * Get owner ID and working copy of existing ACL. If there's no ACL,
diff --git a/src/test/regress/expected/privileges.out b/src/test/regress/expected/privileges.out
index 88bdc2cdfcb..2c5dce47460 100644
--- a/src/test/regress/expected/privileges.out
+++ b/src/test/regress/expected/privileges.out
@@ -536,7 +536,7 @@ REVOKE ALL PRIVILEGES ON LANGUAGE sql FROM PUBLIC;
 GRANT USAGE ON LANGUAGE sql TO regressuser1; -- ok
 GRANT USAGE ON LANGUAGE c TO PUBLIC; -- fail
 ERROR:  language "c" is not trusted
-HINT:  Only superusers can use untrusted languages.
+DETAIL:  GRANT and REVOKE are not allowed on untrusted languages, because only superusers can use untrusted languages.
 SET SESSION AUTHORIZATION regressuser1;
 GRANT USAGE ON LANGUAGE sql TO regressuser2; -- fail
 WARNING:  no privileges were granted for "sql"