diff --git a/src/wp-admin/includes/plugin.php b/src/wp-admin/includes/plugin.php
index 2de370c64d..9ba6203a53 100644
--- a/src/wp-admin/includes/plugin.php
+++ b/src/wp-admin/includes/plugin.php
@@ -1812,15 +1812,17 @@ function menu_page_url( $menu_slug, $echo = true ) {
  * @since 1.5.0
  *
  * @global string $parent_file
- * @global array $menu
- * @global array $submenu
+ * @global array  $menu
+ * @global array  $submenu
  * @global string $pagenow
  * @global string $typenow
  * @global string $plugin_page
- * @global array $_wp_real_parent_file
- * @global array $_wp_menu_nopriv
- * @global array $_wp_submenu_nopriv
+ * @global array  $_wp_real_parent_file
+ * @global array  $_wp_menu_nopriv
+ * @global array  $_wp_submenu_nopriv
  *
+ * @param string $parent The slug name for the parent menu (or the file name of a standard
+ *                       WordPress admin page). Default empty string.
  * @return string The parent file of the current admin page.
  */
 function get_admin_page_parent( $parent = '' ) {