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-rw-r--r--doc/src/sgml/ddl.sgml3
1 files changed, 2 insertions, 1 deletions
diff --git a/doc/src/sgml/ddl.sgml b/doc/src/sgml/ddl.sgml
index 8314fce78ff..4c1d2f607bb 100644
--- a/doc/src/sgml/ddl.sgml
+++ b/doc/src/sgml/ddl.sgml
@@ -3827,7 +3827,8 @@ ALTER TABLE measurement ATTACH PARTITION measurement_y2008m02
the system will be able to skip the scan to validate the implicit
partition constraint. Without such a constraint, the table will be
scanned to validate the partition constraint while holding an
- <literal>ACCESS EXCLUSIVE</literal> lock on the parent table.
+ <literal>ACCESS EXCLUSIVE</literal> lock on that partition
+ and a <literal>SHARE UPDATE EXCLUSIVE</literal> lock on the parent table.
One may then drop the constraint after <command>ATTACH PARTITION</command>
is finished, because it is no longer necessary.
</para>