diff --git a/framework/validators/UniqueValidator.php b/framework/validators/UniqueValidator.php
index 46b52e897b..c760816dc6 100644
--- a/framework/validators/UniqueValidator.php
+++ b/framework/validators/UniqueValidator.php
@@ -23,9 +23,9 @@ use yii\db\ActiveRecordInterface;
  * ['a1', 'unique']
  * // a1 needs to be unique, but column a2 will be used to check the uniqueness of the a1 value
  * ['a1', 'unique', 'targetAttribute' => 'a2']
- * // a1 and a2 need to unique together, and they both will receive error message
+ * // a1 and a2 need to be unique together, and they both will receive error message
  * [['a1', 'a2'], 'unique', 'targetAttribute' => ['a1', 'a2']]
- * // a1 and a2 need to unique together, only a1 will receive error message
+ * // a1 and a2 need to be unique together, only a1 will receive error message
  * ['a1', 'unique', 'targetAttribute' => ['a1', 'a2']]
  * // a1 needs to be unique by checking the uniqueness of both a2 and a3 (using a1 value)
  * ['a1', 'unique', 'targetAttribute' => ['a2', 'a1' => 'a3']]