diff --git a/doc/go1.16.html b/doc/go1.16.html
index 09e974d..b11af7f 100644
--- a/doc/go1.16.html
+++ b/doc/go1.16.html
@@ -43,6 +43,15 @@
 
 <h3 id="go-command">Go command</h3>
 
+<p><!-- golang.org/issue/24031 -->
+  <code>retract</code> directives may now be used in a <code>go.mod</code> file
+  to indicate that certain published versions of the module should not be used
+  by other modules. A module author may retract a version after a severe problem
+  is discovered or if the version was published unintentionally.<br>
+  TODO: write and link to section in golang.org/ref/mod<br>
+  TODO: write and link to tutorial or blog post
+</p>
+
 <p>
   TODO
 </p>