diff --git a/docs/README.md b/docs/README.md
index e69de29..f85ebd4 100644
--- a/docs/README.md
+++ b/docs/README.md
@@ -0,0 +1 @@
+**[Documentation index is here!](index.md)**
diff --git a/docs/enhancing-and-overriding/how-to-enhance-a-user-model.md b/docs/enhancing-and-overriding/how-to-enhance-a-user-model.md
new file mode 100644
index 0000000..0013c71
--- /dev/null
+++ b/docs/enhancing-and-overriding/how-to-enhance-a-user-model.md
@@ -0,0 +1,72 @@
+How to Enhance a User Model
+===========================
+
+It is obvious that if you started your project development on Yii2 Framework, then your business and domain needs
+are going to be very customized, and more or less unique. While our extension (and of course Yii2 Framework itself!)
+provide sensible defaults where it's possible, we encourage and keep in mind user will extend classes.
+
+Very often you have to override and add your own domain (or application specific code) to your user model. With this
+extension this is very easy and can be done in a few minutes!
+
+For the case if you're using [Sidekit Application Template](../installation/sidekit-application-template.md) or
+[Advanced Application Template](../installation/advanced-application-template.md) create the following class file
+at the `%PROJECT_DIR%/common/models/User.php` path:
+
+```php
+namespace common\models;
+
+use Da\User\Model\User as BaseUser;
+
+class User extends BaseUser
+{
+}
+```
+
+Then adjust configuration of `yii2-usuario` extension module as follows:
+
+```php
+'modules' => [
+    'user' => [
+        'class' => Da\User\Module::class,
+        'classMap' => [
+            'User' => common\models\User::class,
+        ],
+    ],
+],
+```
+
+Another way to do that is to use Yii2 Dependency Injection configuration as we extensively use service container
+feature. This is good approach too:
+
+```php
+'container' => [
+    'definitions' => [
+        Da\User\Model\User::class => common\models\User::class,
+    ],
+],
+```
+
+Finally you can now add new methods, properties, and other things to your new `User` model class:
+
+```php
+// model
+class User extends BaseUser
+{
+    public function addFriend(User $friend)
+    {
+        // ...
+    }
+}
+
+// somewhere in controller
+class ProfileController extends Controller
+{
+    public function actionAddFriend(int $id)
+    {
+        Yii::$app->user->identity->addFriend(User::findOne($id));
+    }
+}
+```
+
+> This is absolutely good way to extend almost any class of the extension. For more information you could
+> check `Da\User\Bootstrap` class file to see what you have in your control.
diff --git a/docs/index.md b/docs/index.md
index a643efa..7275036 100644
--- a/docs/index.md
+++ b/docs/index.md
@@ -22,6 +22,11 @@ Installation
 - [Advanced Application Template](installation/advanced-application-template.md)
 - [Basic Application Template](installation/basic-application-template.md)
 
+Enhancing and Overriding
+------------------------
+
+- [How to Enhance a User Model](enhancing-and-overriding/how-to-enhance-a-user-model.md)
+
 Helpful Guides
 --------------
 
diff --git a/lib/User/Controller/SecurityController.php b/lib/User/Controller/SecurityController.php
index 617a896..d9ff254 100644
--- a/lib/User/Controller/SecurityController.php
+++ b/lib/User/Controller/SecurityController.php
@@ -19,13 +19,14 @@ use Da\User\Query\SocialNetworkAccountQuery;
 use Da\User\Service\SocialNetworkAccountConnectService;
 use Da\User\Service\SocialNetworkAuthenticateService;
 use Da\User\Traits\ContainerAwareTrait;
+use Yii;
 use yii\authclient\AuthAction;
 use yii\base\Module;
 use yii\filters\AccessControl;
 use yii\filters\VerbFilter;
 use yii\web\Controller;
-use Yii;
-use \yii\web\Response;
+use yii\web\Response;
+use yii\widgets\ActiveForm;
 
 class SecurityController extends Controller
 {
@@ -113,6 +114,11 @@ class SecurityController extends Controller
         /** @var FormEvent $event */
         $event = $this->make(FormEvent::class, [$form]);
 
+        if (Yii::$app->request->isAjax && $form->load(Yii::$app->request->post())) {
+            Yii::$app->response->format = Response::FORMAT_JSON;
+            return ActiveForm::validate($form);
+        }
+
         if ($form->load(Yii::$app->request->post())) {
             $this->trigger(FormEvent::EVENT_BEFORE_LOGIN, $event);
             if ($form->login()) {
diff --git a/lib/User/Model/User.php b/lib/User/Model/User.php
index 385891e..da29cba 100644
--- a/lib/User/Model/User.php
+++ b/lib/User/Model/User.php
@@ -28,7 +28,7 @@ use yii\web\IdentityInterface;
  *
  * @property bool $isAdmin
  * @property bool $isBlocked
- * @property bool $isConfirmed
+ * @property bool $isConfirmed whether user account has been confirmed or not
  *
  * Database fields:
  * @property int $id
@@ -224,7 +224,8 @@ class User extends ActiveRecord implements IdentityInterface
     }
 
     /**
-     * @return bool
+     * Returns whether user account has been confirmed or not.
+     * @return bool whether user account has been confirmed or not
      */
     public function getIsConfirmed()
     {