Index: docs/manual/OptionalTasks/junitreport.html
===================================================================
--- docs/manual/OptionalTasks/junitreport.html	(revision 421355)
+++ docs/manual/OptionalTasks/junitreport.html	(working copy)
@@ -95,6 +95,13 @@
     <td align="center" valign="top">No. Default to current directory</td>
   </tr>
 </table>
+<p>A note about the difference between <tt>frames</tt> and
+<tt>noframes</tt> formats: the <tt>frames</tt> transformation uses
+xslt redirecting to output into different files and the
+<tt>noframes</tt> transformation does not use redirecting. Ant relies
+on this assumption, so it must be preserved when you use custom xslt
+transformation for junit reports.</p>
+
 <h3>Nested Element of the report tag</h3>
 <h4>param</h4>
 <em>Since Ant 1.7</em>the report tag supports nested param tags.