From ac42f285a656acceb9eaed8937b88cc63ac3a947 Mon Sep 17 00:00:00 2001
From: Taiki Koshino <koshio@sraoss.co.jp>
Date: Wed, 5 Aug 2026 12:49:01 +0900
Subject: [PATCH v1] doc: Define MXID acronym and link it to multixact
 wraparound section

XID is defined as an acronym in the documentation,
but MXID (Multixact ID) was used without a proper definition.
Add an entry for MXID to acronyms.sgml with a link to
the "Multixacts and Wraparound" section,
and introduce the acronym at the first occurrence in maintenance.sgml.
---
 doc/src/sgml/acronyms.sgml    | 9 +++++++++
 doc/src/sgml/maintenance.sgml | 2 +-
 2 files changed, 10 insertions(+), 1 deletion(-)

diff --git a/doc/src/sgml/acronyms.sgml b/doc/src/sgml/acronyms.sgml
index 2f906e9f018..4dc3eaf3cef 100644
--- a/doc/src/sgml/acronyms.sgml
+++ b/doc/src/sgml/acronyms.sgml
@@ -494,6 +494,15 @@
     </listitem>
    </varlistentry>
 
+   <varlistentry>
+    <term><acronym>MXID</acronym></term>
+    <listitem>
+     <para>
+      <link linkend="vacuum-for-multixact-wraparound">Multixact Identifier</link>
+     </para>
+    </listitem>
+   </varlistentry>
+
    <varlistentry>
     <term><acronym>NLS</acronym></term>
     <listitem>
diff --git a/doc/src/sgml/maintenance.sgml b/doc/src/sgml/maintenance.sgml
index 0eec6e2e888..336e0c00e71 100644
--- a/doc/src/sgml/maintenance.sgml
+++ b/doc/src/sgml/maintenance.sgml
@@ -766,7 +766,7 @@ HINT:  Execute a database-wide VACUUM in that database.
     </indexterm>
 
     <para>
-     <firstterm>Multixact IDs</firstterm> are used to support row locking by
+     <firstterm>Multixact IDs</firstterm> (<acronym>MXID</acronym>) are used to support row locking by
      multiple transactions.  Since there is only limited space in a tuple
      header to store lock information, that information is encoded as
      a <quote>multiple transaction ID</quote>, or multixact ID for short,
-- 
2.52.0