diff --git a/lib/experimental/navigation-theme-opt-in.php b/lib/experimental/navigation-theme-opt-in.php
index 547aa8b88ea7d1..27dbabaf234486 100644
--- a/lib/experimental/navigation-theme-opt-in.php
+++ b/lib/experimental/navigation-theme-opt-in.php
@@ -29,6 +29,8 @@
  *
  * @see https://core.trac.wordpress.org/ticket/50544
  *
+ * @global WP_Customize_Manager $wp_customize
+ *
  * @param int   $menu_id         ID of the updated menu.
  * @param int   $menu_item_db_id ID of the new menu item.
  * @param array $args            An array of arguments used to update/add the menu item.