diff --git a/docs/guide-ru/tutorial-core-validators.md b/docs/guide-ru/tutorial-core-validators.md
index 0cd1aeee73..df180b3074 100644
--- a/docs/guide-ru/tutorial-core-validators.md
+++ b/docs/guide-ru/tutorial-core-validators.md
@@ -308,6 +308,13 @@ function foo($model, $attribute) {
         // нормализация значения происходит тут
         return $value;
     }],
+    
+    // нормализует значение "phone" используя функцию "normalizePhone"
+    ['phone', 'filter', 'filter' => [$this, 'normalizePhone']],
+        
+    public function normalizePhone($value) {
+        return $value;
+    }
 ]
 ```
 
diff --git a/docs/guide/tutorial-core-validators.md b/docs/guide/tutorial-core-validators.md
index da9efe6254..48f0318325 100644
--- a/docs/guide/tutorial-core-validators.md
+++ b/docs/guide/tutorial-core-validators.md
@@ -367,6 +367,13 @@ section for complete coverage about uploading files and performing validation ab
         // normalize phone input here
         return $value;
     }],
+    
+    // normalize "phone" using the function "normalizePhone"
+    ['phone', 'filter', 'filter' => [$this, 'normalizePhone']],
+    
+    public function normalizePhone($value) {
+        return $value;
+    }
 ]
 ```