Index: HACKING
===================================================================
--- HACKING	(revision 15335)
+++ HACKING	(working copy)
@@ -1140,7 +1140,15 @@
 instead.
 
 The email message should start off with a log message, as described in
-"Writing log messages" above.  The patch itself should be in unified
+"Writing log messages" above. It should be enclosed in triple square
+brackets just like this:
+
+   [[[
+   * HACKING
+     Improving the patch submission guidelines
+   ]]]
+
+The patch itself should be in unified
 diff format (e.g., with "svn diff").  Send the patch as an attachment,
 with a mime-type of text/x-diff, text/x-patch, or text/plain.  (Most
 people's mailreaders can display those inline, and having the patch as