From 463ed8834e96f9987ebcd97550052f906ef02345 Mon Sep 17 00:00:00 2001
From: Alvaro Herrera <alvherre@alvh.no-ip.org>
Date: Thu, 6 May 2021 17:17:56 -0400
Subject: [PATCH] Document lock level used by ALTER TABLE VALIDATE CONSTRAINT

Backpatch all the way back to 9.6.

Author: Simon Riggs <simon.riggs@enterprisedb.com>
Discussion: https://postgr.es/m/CANbhV-EwxvdhHuOLdfG2ciYrHOHXV=mm6=fD5aMhqcH09Li3Tg@mail.gmail.com
---
 doc/src/sgml/ref/alter_table.sgml | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/doc/src/sgml/ref/alter_table.sgml b/doc/src/sgml/ref/alter_table.sgml
index 9b2e4c5749..ab5e6bf3d4 100644
--- a/doc/src/sgml/ref/alter_table.sgml
+++ b/doc/src/sgml/ref/alter_table.sgml
@@ -476,6 +476,9 @@ WITH ( MODULUS <replaceable class="parameter">numeric_literal</replaceable>, REM
       endterm="sql-altertable-notes-title"/> below for an explanation of the
       usefulness of this command.)
      </para>
+     <para>
+      This command acquires a <literal>SHARE UPDATE EXCLUSIVE</literal> lock.
+     </para>
     </listitem>
    </varlistentry>