diff --git a/docs/guide/input-validation.md b/docs/guide/input-validation.md
index f34c41f895..35f3f7ed86 100644
--- a/docs/guide/input-validation.md
+++ b/docs/guide/input-validation.md
@@ -312,7 +312,7 @@ the method/function is:
 ```php
 /**
  * @param string $attribute the attribute currently being validated
- * @param array $params the additional name-value pairs given in the rule
+ * @param mixed $params the value of the "params" given in the rule
  */
 function ($attribute, $params)
 ```
diff --git a/framework/validators/InlineValidator.php b/framework/validators/InlineValidator.php
index c4f4b950cf..3df96dbc70 100644
--- a/framework/validators/InlineValidator.php
+++ b/framework/validators/InlineValidator.php
@@ -26,7 +26,9 @@ class InlineValidator extends Validator
 {
     /**
      * @var string|\Closure an anonymous function or the name of a model class method that will be
-     * called to perform the actual validation. The signature of the method should be like the following:
+     * called to perform the actual validation. The signature of the method should be like the following,
+     * where `$attribute` is the name of the attribute to be validated, and `$params` contains the value
+     * of [[params]] that you specify when declaring the inline validation rule:
      *
      * ~~~
      * function foo($attribute, $params)
@@ -34,7 +36,7 @@ class InlineValidator extends Validator
      */
     public $method;
     /**
-     * @var array additional parameters that are passed to the validation method
+     * @var mixed additional parameters that are passed to the validation method
      */
     public $params;
     /**
diff --git a/tests/unit/framework/validators/ValidatorTest.php b/tests/unit/framework/validators/ValidatorTest.php
index 3205aab2d1..b5ae88a7ea 100644
--- a/tests/unit/framework/validators/ValidatorTest.php
+++ b/tests/unit/framework/validators/ValidatorTest.php
@@ -57,9 +57,10 @@ class ValidatorTest extends TestCase
         $this->assertInstanceOf(BooleanValidator::className(), $val);
         $this->assertSame(['a', 'b'], $val->on);
         $this->assertSame(['c', 'd', 'e'], $val->except);
-        $val = TestValidator::createValidator('inlineVal', $model, ['val_attr_a']);
+        $val = TestValidator::createValidator('inlineVal', $model, ['val_attr_a'], ['params' => ['foo' => 'bar']]);
         $this->assertInstanceOf(InlineValidator::className(), $val);
         $this->assertSame('inlineVal', $val->method);
+        $this->assertSame(['foo' => 'bar'], $val->params);
     }
 
     public function testValidate()