Index: wp-includes/feed-rss2.php
===================================================================
--- wp-includes/feed-rss2.php	(revision 6254)
+++ wp-includes/feed-rss2.php	(working copy)
@@ -9,6 +9,7 @@
 	xmlns:content="http://purl.org/rss/1.0/modules/content/"
 	xmlns:wfw="http://wellformedweb.org/CommentAPI/"
 	xmlns:dc="http://purl.org/dc/elements/1.1/"
+	xmlns:atom="http://www.w3.org/2005/Atom"
 	<?php do_action('rss2_ns'); ?>
 >
 
@@ -19,6 +20,7 @@
 	<pubDate><?php echo mysql2date('D, d M Y H:i:s +0000', get_lastpostmodified('GMT'), false); ?></pubDate>
 	<?php the_generator( 'rss2' ); ?>
 	<language><?php echo get_option('rss_language'); ?></language>
+	<atom:link rel="self" type="application/rss+xml" href="<?php bloginfo('rss2_url'); ?>" />
 	<?php do_action('rss2_head'); ?>
 	<?php while( have_posts()) : the_post(); ?>
 	<item>
Index: wp-includes/feed-rss2-comments.php
===================================================================
--- wp-includes/feed-rss2-comments.php	(revision 6254)
+++ wp-includes/feed-rss2-comments.php	(working copy)
@@ -6,6 +6,7 @@
 <rss version="2.0"
 	xmlns:content="http://purl.org/rss/1.0/modules/content/"
 	xmlns:dc="http://purl.org/dc/elements/1.1/"
+	xmlns:atom="http://www.w3.org/2005/Atom"
 	>
 <channel>
 	<title><?php
@@ -20,6 +21,7 @@
 	<description><?php bloginfo_rss("description") ?></description>
 	<pubDate><?php echo gmdate('r'); ?></pubDate>
 	<?php the_generator( 'rss2' ); ?>
+	<atom:link rel="self" type="application/rss+xml" href="<?php bloginfo_rss('comments_rss2_url'); ?>" />
 	<?php do_action('commentsrss2_head'); ?>
 <?php
 if ( have_comments() ) : while ( have_comments() ) : the_comment();