diff --git a/src/wp-admin/includes/ajax-actions.php b/src/wp-admin/includes/ajax-actions.php
index e05c4108f5..7c0004a1d7 100644
--- a/src/wp-admin/includes/ajax-actions.php
+++ b/src/wp-admin/includes/ajax-actions.php
@@ -1950,6 +1950,8 @@ function wp_ajax_set_post_thumbnail() {
  * Ajax handler for setting the featured image for an attachment.
  *
  * @since 4.0.0
+ *
+ * @see set_post_thumbnail()
  */
 function wp_ajax_set_attachment_thumbnail() {
 	if ( empty( $_POST['urls'] ) || ! is_array( $_POST['urls'] ) ) {