diff --git a/tinyfilemanager.php b/tinyfilemanager.php
index 1184536..40efb8a 100644
--- a/tinyfilemanager.php
+++ b/tinyfilemanager.php
@@ -3230,6 +3230,9 @@ class FM_Zipper
  */
 class FM_Zipper_Tar
 {
+    /**
+     * @var PharData|null
+     */
     private $tar;
 
     public function __construct()