Index: ch04.xml
===================================================================
--- ch04.xml	(revision 1906)
+++ ch04.xml	(working copy)
@@ -1995,6 +1995,15 @@
         longer exists, and the user will be forced to <command>svn
         switch</command> to the new location.
         </para>
+	
+     <para>One problem with mixing multiple projects within one
+       repository is that users may become confused about which
+       commits apply to <emphasis>their</emphasis> project.  This is
+       especially true if, as is commonly the case, a commit to the
+       repository triggers an automated email message to the
+       development group. A user working on a less busy project may
+       have to sift through dozens of emails that have nothing to do
+       with their work.</para>
       
     </sect2>
     
