diff --git a/source b/source
index 6c72a08a9b2..0bf0e2de73f 100644
--- a/source
+++ b/source
@@ -8294,7 +8294,9 @@ interface <dfn>DOMStringList</dfn> {
        <span>agent cluster</span>.</p></li>
 
        <li>
-        <p>If <var>agentCluster</var>'s <span>allow sidechannel attacks</span> is false, then throw
+        <p>If <var>agentCluster</var>'s <dfn>allow sidechannel attacks</dfn> is false, then throw
+        <!-- TODO: this is not the place to <dfn> this, but doing this for now so the build does not
+             fail -->
         a <span>"<code>DataCloneError</code>"</span> <code>DOMException</code>.</p>
 
         <p class="note">This check is only needed when serializing (and not when deserializing) as