diff --git a/src/wp-includes/feed.php b/src/wp-includes/feed.php
index 27f30b85e1..f673e91d8b 100644
--- a/src/wp-includes/feed.php
+++ b/src/wp-includes/feed.php
@@ -7,6 +7,7 @@
  *
  * @package WordPress
  * @subpackage Feed
+ * @since 2.1.0
  */
 
 /**