diff --git a/src/wp-admin/includes/upgrade.php b/src/wp-admin/includes/upgrade.php
index 802269e047..94d9d335f3 100644
--- a/src/wp-admin/includes/upgrade.php
+++ b/src/wp-admin/includes/upgrade.php
@@ -2160,6 +2160,8 @@ function upgrade_530() {
  *
  * @ignore
  * @since 5.5.0
+ *
+ * @global int $wp_current_db_version The old (current) database version.
  */
 function upgrade_550() {
 	global $wp_current_db_version;
@@ -2198,6 +2200,9 @@ function upgrade_550() {
  *
  * @ignore
  * @since 5.6.0
+ *
+ * @global int  $wp_current_db_version The old (current) database version.
+ * @global wpdb $wpdb                  WordPress database abstraction object.
  */
 function upgrade_560() {
 	global $wp_current_db_version, $wpdb;