diff --git a/doc/src/sgml/pgbuffercache.sgml b/doc/src/sgml/pgbuffercache.sgml
index 27fdfc67a39..afe2d978340 100644
--- a/doc/src/sgml/pgbuffercache.sgml
+++ b/doc/src/sgml/pgbuffercache.sgml
@@ -273,7 +273,7 @@
   </para>
  </sect2>
 
- <sect2>
+ <sect2 id="pgbuffercache-usage-counts">
   <title>The <function>pg_buffercache_usage_counts()</function> Function</title>
 
   <para>