diff --git a/src/wp-includes/nav-menu.php b/src/wp-includes/nav-menu.php
index 1881b54247..53d4a15d0e 100644
--- a/src/wp-includes/nav-menu.php
+++ b/src/wp-includes/nav-menu.php
@@ -988,11 +988,12 @@ function wp_setup_nav_menu_item( $menu_item ) {
  *
  * @since 3.0.0
  *
- * @param int    $object_id   The ID of the original object.
- * @param string $object_type The type of object, such as 'taxonomy' or 'post_type'.
- * @param string $taxonomy    If $object_type is 'taxonomy', $taxonomy is the name of the tax
- *                            that $object_id belongs to.
- * @return int[] The array of menu item IDs; empty array if none;
+ * @param int    $object_id   Optional. The ID of the original object. Default 0.
+ * @param string $object_type Optional. The type of object, such as 'post_type' or 'taxonomy'.
+ *                            Default 'post_type'.
+ * @param string $taxonomy    Optional. If $object_type is 'taxonomy', $taxonomy is the name
+ *                            of the tax that $object_id belongs to. Default empty.
+ * @return int[] The array of menu item IDs; empty array if none.
  */
 function wp_get_associated_nav_menu_items( $object_id = 0, $object_type = 'post_type', $taxonomy = '' ) {
 	$object_id     = (int) $object_id;