diff --git a/src/wp-admin/includes/ajax-actions.php b/src/wp-admin/includes/ajax-actions.php
index e132ac8101..0008ed1843 100644
--- a/src/wp-admin/includes/ajax-actions.php
+++ b/src/wp-admin/includes/ajax-actions.php
@@ -3358,6 +3358,8 @@ function wp_ajax_save_wporg_username() {
  * @since 4.6.0
  *
  * @see Theme_Upgrader
+ *
+ * @global WP_Filesystem_Base $wp_filesystem Subclass
  */
 function wp_ajax_install_theme() {
 	check_ajax_referer( 'updates' );
@@ -3465,6 +3467,8 @@ function wp_ajax_install_theme() {
  * @since 4.6.0
  *
  * @see Theme_Upgrader
+ *
+ * @global WP_Filesystem_Base $wp_filesystem Subclass
  */
 function wp_ajax_update_theme() {
 	check_ajax_referer( 'updates' );
@@ -3550,6 +3554,8 @@ function wp_ajax_update_theme() {
  * @since 4.6.0
  *
  * @see delete_theme()
+ *
+ * @global WP_Filesystem_Base $wp_filesystem Subclass
  */
 function wp_ajax_delete_theme() {
 	check_ajax_referer( 'updates' );
@@ -3618,6 +3624,8 @@ function wp_ajax_delete_theme() {
  * @since 4.6.0
  *
  * @see Plugin_Upgrader
+ *
+ * @global WP_Filesystem_Base $wp_filesystem Subclass
  */
 function wp_ajax_install_plugin() {
 	check_ajax_referer( 'updates' );
@@ -3717,6 +3725,8 @@ function wp_ajax_install_plugin() {
  * @since 4.2.0
  *
  * @see Plugin_Upgrader
+ *
+ * @global WP_Filesystem_Base $wp_filesystem Subclass
  */
 function wp_ajax_update_plugin() {
 	check_ajax_referer( 'updates' );
@@ -3820,6 +3830,8 @@ function wp_ajax_update_plugin() {
  * @since 4.6.0
  *
  * @see delete_plugins()
+ *
+ * @global WP_Filesystem_Base $wp_filesystem Subclass
  */
 function wp_ajax_delete_plugin() {
 	check_ajax_referer( 'updates' );