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-rw-r--r--doc/src/sgml/ref/alter_table.sgml4
1 files changed, 3 insertions, 1 deletions
diff --git a/doc/src/sgml/ref/alter_table.sgml b/doc/src/sgml/ref/alter_table.sgml
index 1a49f321cf7..925f1084e00 100644
--- a/doc/src/sgml/ref/alter_table.sgml
+++ b/doc/src/sgml/ref/alter_table.sgml
@@ -251,7 +251,9 @@ WITH ( MODULUS <replaceable class="parameter">numeric_literal</replaceable>, REM
table. Even if there is no <literal>NOT NULL</literal> constraint on the
parent, such a constraint can still be added to individual partitions,
if desired; that is, the children can disallow nulls even if the parent
- allows them, but not the other way around.
+ allows them, but not the other way around. It is also possible to drop
+ the <literal>NOT NULL</literal> constraint from <literal>ONLY</literal>
+ the parent table, which does not remove it from the children.
</para>
</listitem>
</varlistentry>