diff --git a/src/backend/catalog/heap.c b/src/backend/catalog/heap.c
index 9c45544815..3c83fe6bab 100644
--- a/src/backend/catalog/heap.c
+++ b/src/backend/catalog/heap.c
@@ -714,8 +714,8 @@ CheckAttributeType(const char *attname,
  *		Construct and insert a new tuple in pg_attribute.
  *
  * Caller has already opened and locked pg_attribute.  new_attribute is the
- * attribute to insert.  attcacheoff is always initialized to -1, attacl and
- * attoptions are always initialized to NULL.
+ * attribute to insert.  attcacheoff is always initialized to -1, attacl,
+ * attfdwoptions and attmissingval are always initialized to NULL.
  *
  * indstate is the index state for CatalogTupleInsertWithInfo.  It can be
  * passed as NULL, in which case we'll fetch the necessary info.  (Don't do