diff --git a/doc/src/sgml/config.sgml b/doc/src/sgml/config.sgml
index 20ccb2d6b54..0a4b3e55ba5 100644
--- a/doc/src/sgml/config.sgml
+++ b/doc/src/sgml/config.sgml
@@ -3399,8 +3399,9 @@ include_dir 'conf.d'
         This parameter enables compression of WAL using the specified
         compression method.
         When enabled, the <productname>PostgreSQL</productname>
-        server compresses full page images written to WAL when
-        <xref linkend="guc-full-page-writes"/> is on or during a base backup.
+        server compresses full page images written to WAL (e.g. when
+        <xref linkend="guc-full-page-writes"/> is on, during a base backup,
+        etc.).
         A compressed page image will be decompressed during WAL replay.
         The supported methods are <literal>pglz</literal>,
         <literal>lz4</literal> (if <productname>PostgreSQL</productname>