diff --git a/README.md b/README.md
index dba5c2c..9b0ba38 100644
--- a/README.md
+++ b/README.md
@@ -17,15 +17,32 @@ echo $form->field($model, 'coordinates')->widget('kolyunya\yii2\widgets\MapInput
 ~~~
 
 ### Extended example
+To configure asset manager use the following configuration
+
+~~~php
+return [
+    // ...
+    'components' => [
+        'assetManager' => [
+            'bundles' => [
+                \kolyunya\yii2\assets\MapInputAsset::class => [
+                    'options' => [
+                        'key' => 'YOUR_GOOGLE_MAPS_API_KEY',
+                        'language' => 'en',
+                        'libraries' => 'places',
+                    ],
+                ],
+            ],
+        ],
+    ],
+];
+~~~
+
 An exhaustive list of widget parameters (which are not derived from [yii\widgets\InputWidget](http://www.yiiframework.com/doc-2.0/yii-widgets-inputwidget.html)) available for configuration is described in the following example.
 ~~~php
 echo $form->field($model, 'coordinates')->widget(
     'kolyunya\yii2\widgets\MapInputWidget',
     [
-
-        // Google maps browser key.
-        'key' => $key,
-
         // Initial map center latitude. Used only when the input has no value.
         // Otherwise the input value latitude will be used as map center.
         // Defaults to 0.
diff --git a/sources/assets/MapInputAsset.php b/sources/assets/MapInputAsset.php
index ca0a6ba..5189ea9 100644
--- a/sources/assets/MapInputAsset.php
+++ b/sources/assets/MapInputAsset.php
@@ -2,11 +2,35 @@
 
 namespace kolyunya\yii2\assets;
 
+/**
+ * Class MapInputAsset
+ *
+ * To configure asset manager use the following configuration
+ *
+ * return [
+ *     // ...
+ *     'components' => [
+ *         'assetManager' => [
+ *             'bundles' => [
+ *                 \kolyunya\yii2\assets\MapInputAsset::class => [
+ *                     'options' => [
+ *                         'key' => 'YOUR_GOOGLE_MAPS_API_KEY',
+ *                         'language' => 'en',
+ *                         'libraries' => 'places',
+ *                     ],
+ *                 ],
+ *             ],
+ *         ],
+ *     ],
+ * ];
+ *
+ * http://www.yiiframework.com/doc-2.0/guide-structure-assets.html#customizing-asset-bundles
+ *
+ * @package kolyunya\yii2\assets
+ */
+
 class MapInputAsset extends \yii\web\AssetBundle
 {
-
-    public static $key;
-
     public $sourcePath = '@kolyunya/yii2-map-input-widget/sources/web';
 
     public $depends =
@@ -19,9 +43,16 @@ class MapInputAsset extends \yii\web\AssetBundle
         'position' => \yii\web\View::POS_END,
     ];
 
-    public function __construct($config = [])
+    /** @var array */
+    public $options = [];
+
+    /**
+     * @return void
+     */
+    public function init()
     {
-        $this->js[] = $this->getGoogleMapScriptUrl();
+        $this->js[] = '//maps.googleapis.com/maps/api/js?' . http_build_query($this->options);
+
         if (YII_DEBUG) {
             $this->js[] = 'js/map-input-widget.js';
             $this->css[] = 'css/map-input-widget.css';
@@ -29,16 +60,5 @@ public function __construct($config = [])
             $this->js[] = 'js/map-input-widget.min.js';
             $this->css[] = 'css/map-input-widget.min.css';
         }
-        parent::__construct($config);
-    }
-
-    private function getGoogleMapScriptUrl()
-    {
-        $scriptUrl  =  "//maps.googleapis.com/maps/api/js?";
-        $scriptUrl .= http_build_query([
-            'key' => self::$key,
-            'libraries' => 'places',
-        ]);
-        return $scriptUrl;
     }
 }
diff --git a/sources/widgets/MapInputWidget.php b/sources/widgets/MapInputWidget.php
index 09111f8..cd3914e 100644
--- a/sources/widgets/MapInputWidget.php
+++ b/sources/widgets/MapInputWidget.php
@@ -6,9 +6,6 @@
 
 class MapInputWidget extends \yii\widgets\InputWidget
 {
-
-    public $key;
-
     public $latitude = 0;
 
     public $longitude = 0;
@@ -31,12 +28,8 @@ class MapInputWidget extends \yii\widgets\InputWidget
 
     public function run()
     {
-
         Yii::setAlias('@kolyunya','@vendor/kolyunya');
 
-        // Asset bundle should be configured with the application key
-        $this->configureAssetBundle();
-
         return $this->render(
             'MapInputWidget',
             [
@@ -56,9 +49,4 @@ public function run()
             ]
         );
     }
-
-    private function configureAssetBundle()
-    {
-        \kolyunya\yii2\assets\MapInputAsset::$key = $this->key;
-    }
 }