diff --git a/src/wp-includes/admin-bar.php b/src/wp-includes/admin-bar.php
index d3aec38341..cbb2fd32fb 100644
--- a/src/wp-includes/admin-bar.php
+++ b/src/wp-includes/admin-bar.php
@@ -677,6 +677,8 @@ function wp_admin_bar_shortlink_menu( $wp_admin_bar ) {
  *
  * @global WP_Term  $tag
  * @global WP_Query $wp_the_query
+ * @global int      $user_id      The ID of the user being edited. Not to be confused with the
+ *                                global $user_ID, which contains the ID of the current user.
  *
  * @param WP_Admin_Bar $wp_admin_bar
  */