diff --git a/doc/src/sgml/ddl.sgml b/doc/src/sgml/ddl.sgml
index f8f449ce4b..8515c0e63a 100644
--- a/doc/src/sgml/ddl.sgml
+++ b/doc/src/sgml/ddl.sgml
@@ -4097,7 +4097,8 @@ 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: