diff -urN laconica-0.7.3-fixed/lib/rssaction.php laconica-0.7.3-w-replies/lib/rssaction.php
--- laconica-0.7.3-fixed/lib/rssaction.php	2009-06-08 13:04:03.000000000 +0100
+++ laconica-0.7.3-w-replies/lib/rssaction.php	2009-06-19 16:36:31.000000000 +0100
@@ -208,6 +208,11 @@
         $this->element('sioc:has_creator', array('rdf:resource' => $creator_uri.'#acct'));
         $this->element('laconica:postIcon', array('rdf:resource' => $profile->avatarUrl()));
         $this->element('cc:licence', array('rdf:resource' => common_config('license', 'url')));
+        if ($notice->reply_to) {
+                $replyurl = common_local_url('shownotice',
+                        array('notice' => $notice->reply_to));
+                $this->element('sioc:reply_to', array('rdf:resource' => $replyurl));
+        }
         $this->elementEnd('item');
         $this->creators[$creator_uri] = $profile;
     }