diff --git a/doc/src/sgml/ddl.sgml b/doc/src/sgml/ddl.sgml
index e437e2e655..8f2f8184e9 100644
--- a/doc/src/sgml/ddl.sgml
+++ b/doc/src/sgml/ddl.sgml
@@ -3492,7 +3492,8 @@ ALTER INDEX measurement_city_id_logdate_key
 
     <para>
      Since a partition hierarchy consisting of the partitioned table and its
-     partitions is still an inheritance hierarchy, all the normal rules of
+     partitions is still an inheritance hierarchy,
+     <structfield>tableoid</structfield> and all the normal rules of
      inheritance apply as described in <xref linkend="ddl-inherit"/>, with
      a few exceptions: