diff --git a/doc/go1.17.html b/doc/go1.17.html
index 9d775e169ae..3395c4e6700 100644
--- a/doc/go1.17.html
+++ b/doc/go1.17.html
@@ -619,6 +619,11 @@ Do not send CLs removing the interior tags from such phrases.
       a list of additional handles to be inherited by the new child
       process. <code>ParentProcess</code> permits specifying the
       parent process of the new process.
+
+    <p><!-- CL 311570 -->
+      The constant <code>MSG_CMSG_CLOEXEC</code> is now defined on
+      DragonFly and all OpenBSD systems (it was already defined on
+      some OpenBSD systems and all FreeBSD, NetBSD, and Linux systems).
     </p>
   </dd>
 </dl><!-- syscall -->