diff --git a/doc/src/sgml/pgstatstatements.sgml b/doc/src/sgml/pgstatstatements.sgml
index 930081c429..9e98472c5c 100644
--- a/doc/src/sgml/pgstatstatements.sgml
+++ b/doc/src/sgml/pgstatstatements.sgml
@@ -696,8 +696,9 @@
       <varname>pg_stat_statements.track_planning</varname> controls whether
       planning operations and duration are tracked by the module.
       Enabling this parameter may incur a noticeable performance penalty,
-      especially when queries with the same queryid are executed on many
-      concurrent connections.
+      especially when queries with identical structure are executed by many
+      concurrent connections which compete to update a small number of
+      pg_stat_statements entries.
       The default value is <literal>off</literal>.
       Only superusers can change this setting.
      </para>