diff --git a/wp-includes/feed-rss2-comments.php b/wp-includes/feed-rss2-comments.php
index 3636fe9e0..047c122c6 100644
--- a/wp-includes/feed-rss2-comments.php
+++ b/wp-includes/feed-rss2-comments.php
@@ -21,7 +21,7 @@ echo '<?xml version="1.0" encoding="'.get_option('blog_charset').'"?'.'>';
 	<description><?php bloginfo_rss("description") ?></description>
 	<pubDate><?php echo gmdate('r'); ?></pubDate>
 	<generator>http://wordpress.org/?v=<?php echo $wp_version ?></generator>
-
+	<?php do_action('commentsrss2_head'); ?>
 <?php
 if ( have_comments() ) : while ( have_comments() ) : the_comment();
 	$comment_post = get_post($comment->comment_post_ID);