diff --git a/doc/go1.21.html b/doc/go1.21.html
index 97d73720f2..a3a019fe5b 100644
--- a/doc/go1.21.html
+++ b/doc/go1.21.html
@@ -1244,6 +1244,13 @@ Do not send CLs removing the interior tags from such phrases.
   <code>c-archive</code>, <code>c-shared</code>, <code>shared</code>, <code>pie</code>, <code>plugin</code>.
 </p>
 
+<h3 id="loong64">loong64</h3>
+
+<p><!-- go.dev/issue/53301, CL 455075, CL 425474, CL 425476, CL 425478, CL 489576 -->
+  The <code>linux/loong64</code> port now supports <code>-buildmode=c-archive</code>,
+  <code>-buildmode=c-shared</code> and <code>-buildmode=pie</code>.
+</p>
+
 <!-- proposals for x repos that don't need to be mentioned here but
      are picked up by the relnote tool. -->
 <!-- https://go.dev/issue/54232 -->