diff --git a/doc/go1.16.html b/doc/go1.16.html
index e1e8c7a833..7ddb4a935e 100644
--- a/doc/go1.16.html
+++ b/doc/go1.16.html
@@ -982,6 +982,13 @@ func TestFoo(t *testing.T) {
       <a href="/pkg/io/fs/"><code>io/fs</code></a> package.
       This should not affect any existing code.
     </p>
+
+    <p><!-- CL 243911 -->
+      The new <a href="/pkg/os/#DirFS"><code>DirFS</code></a> function
+      provides an implementation of
+      <a href="/pkg/io/fs/#FS"><code>fs.FS</code></a> backed by a tree
+      of operating system files.
+    </p>
   </dd>
 </dl><!-- os -->