diff --git a/src/wp-includes/class.wp-dependencies.php b/src/wp-includes/class.wp-dependencies.php
index a1a0363876..03484181cf 100644
--- a/src/wp-includes/class.wp-dependencies.php
+++ b/src/wp-includes/class.wp-dependencies.php
@@ -211,6 +211,7 @@ class WP_Dependencies {
 	 *                                 as a query string for cache busting purposes. If version is set to false, a version
 	 *                                 number is automatically added equal to current installed WordPress version.
 	 *                                 If set to null, no version is added.
+	 * @param mixed            $args   Optional. Custom property of the item. NOT the class property $args. Examples: $media, $in_footer. 
 	 * @return bool Whether the item has been registered. True on success, false on failure.
 	 */
 	public function add( $handle, $src, $deps = array(), $ver = false, $args = null ) {