diff --git a/doc/src/sgml/ref/alter_table.sgml b/doc/src/sgml/ref/alter_table.sgml
index 6f51cbc..975b395 100644
--- a/doc/src/sgml/ref/alter_table.sgml
+++ b/doc/src/sgml/ref/alter_table.sgml
@@ -1028,11 +1028,11 @@ ALTER TABLE ALL IN TABLESPACE <replaceable class="PARAMETER">name</replaceable>
 
    <para>
     If a table has any descendant tables, it is not permitted to add,
-    rename, or change the type of a column, or rename an inherited constraint
-    in the parent table without doing
+    rename, or change the type of a column, rename or validate an inherited
+    constraint in the parent table without doing
     the same to the descendants.  That is, <command>ALTER TABLE ONLY</command>
     will be rejected.  This ensures that the descendants always have
-    columns matching the parent.
+    columns and constraints matching the parent.
    </para>
 
    <para>