diff --git a/wp-includes/feed.php b/wp-includes/feed.php
index bb204ea203..6b431b1fab 100644
--- a/wp-includes/feed.php
+++ b/wp-includes/feed.php
@@ -261,6 +261,7 @@ function atom_enclosure() {
  *
  * @package WordPress
  * @subpackage Feed
+ * @since 2.4 
  *
  * @param string $data input string
  * @return array $result array(type, value)