--- a/xml/dnsbl.in	Sat Jul 07 21:39:45 2007 -0700
+++ b/xml/dnsbl.in	Sun Jul 08 09:46:55 2007 -0700
@@ -176,6 +176,14 @@
                 allowed to relay thru this mail server with no spam filtering.
             </para>
             <para>
+                Consider the case of a message from A to B passing thru this milter.
+                If that message is not blocked, then we might eventually see a reply
+                message from B to A. If the filtering context for A includes an
+                autowhite entry, then this milter will add an entry in that file to
+                whitelist such replies.  Note that manually editing such autowhite files
+                is not supported.
+            </para>
+            <para>
                 The DNSBL milter reads a text configuration file (dnsbl.conf) on
                 startup, and whenever the config file (or any of the referenced include
                 files) is changed.  The entire configuration file is case insensitive.