diff --git a/framework/validators/Validator.php b/framework/validators/Validator.php
index 903f35c263d..9e232ef8e9b 100644
--- a/framework/validators/Validator.php
+++ b/framework/validators/Validator.php
@@ -132,7 +132,7 @@ class Validator extends Component
      */
     public $skipOnError = true;
     /**
-     * @var bool|null whether this validation rule should be skipped if the attribute value
+     * @var bool whether this validation rule should be skipped if the attribute value
      * is null or an empty string. This property is used only when validating [[yii\base\Model]].
      */
     public $skipOnEmpty = true;