<?php
-// Deprecated. Use rss.php instead.
-require_once (ABSPATH . WPINC . '/rss.php');
-?>
+/**
+ * Deprecated. Use rss.php instead.
+ *
+ * @package WordPress
+ */
+
+_deprecated_file( basename(__FILE__), '2.1', WPINC . '/rss.php' );
+require_once( ABSPATH . WPINC . '/rss.php' );