diff --git a/src/backend/catalog/aclchk.c b/src/backend/catalog/aclchk.c
index 819045203d..d9c02614d1 100644
--- a/src/backend/catalog/aclchk.c
+++ b/src/backend/catalog/aclchk.c
@@ -3449,7 +3449,7 @@ pg_class_aclmask_ext(Oid table_oid, Oid roleid, AclMode mask,
 	 * Check if ACL_MAINTAIN is being checked and, if so, and not already set
 	 * as part of the result, then check if the user is a member of the
 	 * pg_maintain role, which allows VACUUM, ANALYZE, CLUSTER, REFRESH
-	 * MATERIALIZED VIEW, and REINDEX on all relations.
+	 * MATERIALIZED VIEW, REINDEX and LOCK TABLE on all relations.
 	 */
 	if (mask & ACL_MAINTAIN &&
 		!(result & ACL_MAINTAIN) &&