diff --git a/src/helpers.php b/src/helpers.php
index 842be25..1768be8 100644
--- a/src/helpers.php
+++ b/src/helpers.php
@@ -1,11 +1,12 @@
 <?php
 
+use Hekmatinasser\Jalali\Jalali;
 use Hekmatinasser\Verta\Verta;
 
 if (! function_exists('verta')) {
     /**
-     * @param null $datetime
-     * @param null $timezone
+     * @param  Jalali|DateTime|string|int|null  $datetime
+     * @param  DateTimeZone|string|null  $timezone
      * @return Verta
      */
     function verta($datetime = null, $timezone = null): Verta