Index: source
===================================================================
--- source	(revision 1244)
+++ source	(revision 1245)
@@ -8096,6 +8096,20 @@
   elements, then it consists of one group with values but no names,
   and the document is non-conforming.</p>
 
+  <p>If a <code>dl</code> element starts with one or more
+  <code>dd</code> elements, then the first group has no associated
+  name.</p>
+
+  <p>If a <code>dl</code> element ends with one or more
+  <code>dt</code> elements, then the last group has no associated
+  value.</p>
+
+  <p class="note">Such mistakes are often due to using accidentally
+  <code>dd</code> elements in the place of <code>dt</code> elements
+  and vice versa. Conformance checkers can spot such mistakes and
+  might be able to advise authors how to correctly use the markup.</p>
+
+
   <div class="example">
    <p>In the following example, one entry ("Authors") is linked to two
    values ("John" and "Luke").</p>