diff --git a/doc/src/sgml/config.sgml b/doc/src/sgml/config.sgml
index 17d84bd321..82bf6dc76e 100644
--- a/doc/src/sgml/config.sgml
+++ b/doc/src/sgml/config.sgml
@@ -1443,11 +1443,12 @@ include_dir 'conf.d'
        </para>
 
        <para>
-        Older PostgreSQL versions do not have this setting and always use the
+        Older <productname>PostgreSQL</productname> versions do not have this setting and always use the
         client's preferences.  This setting is mainly for backward
         compatibility with those versions.  Using the server's preferences is
         usually better because it is more likely that the server is appropriately
-        configured.
+        configured.  This setting was introduced in
+        <productname>PostgreSQL<productname> 9.4.
        </para>
       </listitem>
      </varlistentry>