The docs currently don't say what wal_compression=on is, so here is a patch.
Christoph
>From 0cb33f052a9c162fa199bc9a71ee29240347e710 Mon Sep 17 00:00:00 2001 From: Christoph Berg <[email protected]> Date: Mon, 29 Jun 2026 11:58:44 +0200 Subject: [PATCH] Document wal_compression=on This was not included when lz4 support was added in 4035cd5d4eee4dae797bfc77ab07f8dcd8781b41, but since the value is still legal and even mentioned in postgresql.conf.sample, it should be documented. --- doc/src/sgml/config.sgml | 1 + 1 file changed, 1 insertion(+) diff --git a/doc/src/sgml/config.sgml b/doc/src/sgml/config.sgml index 569fc0e7dba..d645a50476f 100644 --- a/doc/src/sgml/config.sgml +++ b/doc/src/sgml/config.sgml @@ -3671,6 +3671,7 @@ include_dir 'conf.d' was compiled with <option>--with-lz4</option>) and <literal>zstd</literal> (if <productname>PostgreSQL</productname> was compiled with <option>--with-zstd</option>). + The value <literal>on</literal> is a deprecated alias for <literal>pglz</literal>. The default value is <literal>off</literal>. Only superusers and users with the appropriate <literal>SET</literal> privilege can change this setting. -- 2.53.0
