diff --git a/doc/src/sgml/release-19.sgml b/doc/src/sgml/release-19.sgml
index cb5a220f7c3..d570f6e06e8 100644
--- a/doc/src/sgml/release-19.sgml
+++ b/doc/src/sgml/release-19.sgml
@@ -848,6 +848,22 @@ This is done by changing the default for server variable <link linkend="guc-defa
 </para>
 </listitem>
 
+<!--
+Author: Tomas Vondra <tomas.vondra@postgresql.org>
+2026-08-12 [5838806ce] Change wal_compression=on to the first of zstd, lz4, pglz
+-->
+
+<listitem>
+<para>
+Change the default <link linkend="wal"><acronym>WAL</acronym></link> compression method from <literal>pglz</literal> to the more efficient <literal>zstd</literal> or <literal>lz4</literal> (wenhui qiu)
+<ulink url="&commit_baseurl;5838806ce">&sect;</ulink>
+</para>
+
+<para>
+This only affects configurations with the server variable <link linkend="guc-wal-compression"><varname>wal_compression</varname></link> set to <literal>on</literal>. The default value remains <literal>off</literal>.
+</para>
+</listitem>
+
 <!--
 Author: David Rowley <drowley@postgresql.org>
 2026-03-16 [c456e3911] Optimize tuple deformation