diff --git a/css2/Overview.bs b/css2/Overview.bs
index 34fa459aa9b2..feafca0ebaf8 100644
--- a/css2/Overview.bs
+++ b/css2/Overview.bs
@@ -5466,8 +5466,9 @@ resulting combined margin is called a <dfn data-lt="collapsed margin|collapsing
 
     <li>top and bottom margins of a box that does not establish a new
     block formatting context and that has zero computed 'min-height', zero or ''height/auto''
-    computed 'height', and no
-    in-flow children
+    computed 'height', and either no
+    in-flow children or
+    only in-flow children whose margins also collapse
   </ul>
 </ul>