Add suggestion from r12a

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@@ -266,6 +266,13 @@ <h2><a href="#common_mistakes">Common mistakes when making a transition request<
    <p>Those are intended solely to be used by horizontal groups to 
     <a href="https://www.w3.org/Guide/documentreview/#What_happens_to_unresolved_issues_marked_needs-resolution">bring special attention</a>.</p>
   </li>
+  <li>
+    <p>Don't assume that the horizontal group will be able to 
+      schedule and complete a review within 2 weeks so that you can proceed to CR.</p>
+    <p>They may not even be able to find someone with availability to do the review in that time, 
+      and then they need a week or two to discuss their response after the review, 
+      and then they'll send you comments that may require you to make substantive changes.</p>
+  </li>
  </ol>
  </section>