diff --git a/doc/go1.21.html b/doc/go1.21.html
index 9f53f59c97..3c1d63467b 100644
--- a/doc/go1.21.html
+++ b/doc/go1.21.html
@@ -394,6 +394,8 @@ Do not send CLs removing the interior tags from such phrases.
   maps of any key or element type.
 </p>
 
+<h3 id="cmp">New cmp package</h3>
+
 <p><!-- https://go.dev/issue/59488, CL 469356 -->
   The new <a href="/pkg/cmp/">cmp</a> package defines the type
   constraint <a href="/pkg/cmp/#Ordered"><code>Ordered</code></a> and