diff --git a/doc/src/sgml/config.sgml b/doc/src/sgml/config.sgml
index 8f55026..2472b2d 100644
--- a/doc/src/sgml/config.sgml
+++ b/doc/src/sgml/config.sgml
@@ -2751,8 +2751,8 @@ include_dir 'conf.d'
       <listitem>
        <para>
         Write a message to the server log if checkpoints caused by
-        the filling of checkpoint segment files happen closer together
-        than this many seconds (which suggests that
+        the achieving maximum amount of filled segment files happen closer
+        together than this many seconds (which suggests that
         <varname>max_wal_size</> ought to be raised).  The default is
         30 seconds (<literal>30s</>).  Zero disables the warning.
         No warnings will be generated if <varname>checkpoint_timeout</varname>