diff --git a/composer.json b/composer.json
index 07a7afa..d621132 100644
--- a/composer.json
+++ b/composer.json
@@ -47,7 +47,8 @@
         "php": ">=5.5",
         "yiisoft/yii2": "~2.0.0",
         "yiisoft/yii2-authclient": "^2.1.0",
-        "yiisoft/yii2-bootstrap": "^2.0.0"
+        "yiisoft/yii2-bootstrap": "^2.0.0",
+        "yiisoft/yii2-swiftmailer": "^2.0.0"
     },
     "require-dev": {
         "squizlabs/php_codesniffer": "^2.7",
diff --git a/lib/User/Bootstrap.php b/lib/User/Bootstrap.php
index 7b0d871..27c5509 100644
--- a/lib/User/Bootstrap.php
+++ b/lib/User/Bootstrap.php
@@ -25,6 +25,10 @@ use yii\console\Application as ConsoleApplication;
 use yii\i18n\PhpMessageSource;
 use yii\web\Application as WebApplication;
 
+/**
+ * Bootstrap class of the yii2-usuario extension. Configures container services, initializes translations,
+ * builds class map, and does the other setup actions participating in the application bootstrap process.
+ */
 class Bootstrap implements BootstrapInterface
 {
     /**
@@ -317,7 +321,7 @@ class Bootstrap implements BootstrapInterface
         $mapping = array_merge($defaults, $userClassMap);
 
         foreach ($mapping as $name => $definition) {
-            $map[$this->getRoute($routes, $name)."\\$name"] = $definition;
+            $map[$this->getRoute($routes, $name) . "\\$name"] = $definition;
         }
 
         return $map;
diff --git a/lib/User/Module.php b/lib/User/Module.php
index e799753..0c6eecc 100644
--- a/lib/User/Module.php
+++ b/lib/User/Module.php
@@ -12,8 +12,12 @@
 namespace Da\User;
 
 use Da\User\Contracts\MailChangeStrategyInterface;
+use Da\User\Service\MailService;
 use yii\base\Module as BaseModule;
 
+/**
+ * This is the main module class of the yii2-usuario extension.
+ */
 class Module extends BaseModule
 {
     /**
@@ -41,7 +45,7 @@ class Module extends BaseModule
      */
     public $allowPasswordRecovery = true;
     /**
-     * @var bool Whether user can remove his account
+     * @var bool whether user can remove his account
      */
     public $allowAccountDelete = false;
     /**
@@ -87,6 +91,7 @@ class Module extends BaseModule
     public $blowfishCost = 10;
     /**
      * @var array the class map. How the container should load specific classes
+     * @see Bootstrap::buildClassMap() for more details
      */
     public $classMap = [];
 
@@ -103,5 +108,8 @@ class Module extends BaseModule
         'settings/<action:\w+>' => 'settings/<action>',
     ];
 
+    /**
+     * @var string
+     */
     public $viewPath = '@Da/User/resources/views';
 }