diff --git a/src/wp-admin/includes/media.php b/src/wp-admin/includes/media.php
index ae0a6bc7ea..05832b2d5b 100644
--- a/src/wp-admin/includes/media.php
+++ b/src/wp-admin/includes/media.php
@@ -674,11 +674,16 @@ function media_buttons( $editor_id = 'content' ) {
 }
 
 /**
+ * Retrieves the upload iframe source URL.
+ *
+ * @since 3.0.0
+ *
  * @global int $post_ID
- * @param string $type
- * @param int    $post_id
- * @param string $tab
- * @return string
+ *
+ * @param string $type    Media type.
+ * @param int    $post_id Post ID.
+ * @param string $tab     Media upload tab.
+ * @return string Upload iframe source URL.
  */
 function get_upload_iframe_src( $type = null, $post_id = null, $tab = null ) {
 	global $post_ID;