subsection added

docs/guide/controller.md

@@ -35,28 +35,7 @@ class SiteController extends Controller
 ```
 
 As you can see, typical controller contains actions that are public class methods named as `actionSomething`.
-The output of an action is what the method returns, it could be rendered result or it can be instance of ```yii\web\Response```, for example:
+The output of an action is what the method returns, it could be rendered result or it can be instance of ```yii\web\Response```, for [example](#custom-response-class).
-
-```php
-namespace app\controllers;
-
-use yii\web\Controller;
-use app\components\web\MyCustomResponse; #extended from yii\web\Response
-
-class SiteController extends Controller
-{
-	public function actionCustom()
-	{
-		/*
-		 * do your things here
-		 * since Response in extended from yii\base\Object, you can initialize its values by passing in 
-		 * __constructor() simple array.
-		 */
-		return new MyCustomResponse(['data' => $myCustomData]);
-	}
-}
-```
-
 The return value will be handled by the `response` application
 component which can convert the output to differnet formats such as JSON for example. The default behavior
 is to output the value unchanged though.
@@ -271,4 +250,27 @@ TBD
 See also
 --------
 
+Custom response class
+---------------------
+
+```php
+namespace app\controllers;
+
+use yii\web\Controller;
+use app\components\web\MyCustomResponse; #extended from yii\web\Response
+
+class SiteController extends Controller
+{
+	public function actionCustom()
+	{
+		/*
+		 * do your things here
+		 * since Response in extended from yii\base\Object, you can initialize its values by passing in 
+		 * __constructor() simple array.
+		 */
+		return new MyCustomResponse(['data' => $myCustomData]);
+	}
+}
+```
+
 - [Console](console.md)