diff --git a/src/Contracts/Format.php b/src/Contracts/Format.php
index 19015f6..b6e0e59 100644
--- a/src/Contracts/Format.php
+++ b/src/Contracts/Format.php
@@ -1,5 +1,14 @@
 <?php
 
+/*
+ * This file is part of the jiannei/laravel-response.
+ *
+ * (c) Jiannei <longjian.huang@foxmail.com>
+ *
+ * This source file is subject to the MIT license that is bundled
+ * with this source code in the file LICENSE.
+ */
+
 namespace Jiannei\Response\Laravel\Contracts;
 
 use Illuminate\Http\Resources\Json\JsonResource;
@@ -13,7 +22,7 @@ interface Format
      *
      * @param  array|null  $data
      * @param  string|null  $message
-     * @param int $code
+     * @param  int  $code
      * @param  null  $errors
      * @return array
      */
@@ -37,7 +46,7 @@ public function statusCode($code): int;
      * @param  int  $option
      * @return array
      */
-    public function paginator(AbstractPaginator $resource, string $message = '', int $code = 200, array $headers = [], int $option = 0):array;
+    public function paginator(AbstractPaginator $resource, string $message = '', int $code = 200, array $headers = [], int $option = 0): array;
 
     /**
      * Format collection resource data.
@@ -62,4 +71,4 @@ public function resourceCollection(ResourceCollection $resource, string $message
      * @return array
      */
     public function jsonResource(JsonResource $resource, string $message = '', int $code = 200, array $headers = [], int $option = 0): array;
-}
\ No newline at end of file
+}
diff --git a/src/Providers/LaravelServiceProvider.php b/src/Providers/LaravelServiceProvider.php
index 9928897..d98e6fd 100644
--- a/src/Providers/LaravelServiceProvider.php
+++ b/src/Providers/LaravelServiceProvider.php
@@ -25,7 +25,7 @@ public function boot()
         $format = $this->app['config']['response']['format'];
 
         if (is_string($format) && class_exists($format)) {
-            $this->app->bind(\Jiannei\Response\Laravel\Support\Format::class,$format);
+            $this->app->bind(\Jiannei\Response\Laravel\Support\Format::class, $format);
         }
     }
 
diff --git a/src/Support/Format.php b/src/Support/Format.php
index a10a041..8256bfd 100644
--- a/src/Support/Format.php
+++ b/src/Support/Format.php
@@ -27,7 +27,7 @@ class Format implements \Jiannei\Response\Laravel\Contracts\Format
      *
      * @param  array|null  $data
      * @param  string|null  $message
-     * @param int $code
+     * @param  int  $code
      * @param  null  $errors
      * @return array
      */
diff --git a/tests/FormatTest.php b/tests/FormatTest.php
index e07eef1..103e1e8 100644
--- a/tests/FormatTest.php
+++ b/tests/FormatTest.php
@@ -1,5 +1,14 @@
 <?php
 
+/*
+ * This file is part of the jiannei/laravel-response.
+ *
+ * (c) Jiannei <longjian.huang@foxmail.com>
+ *
+ * This source file is subject to the MIT license that is bundled
+ * with this source code in the file LICENSE.
+ */
+
 namespace Jiannei\Response\Laravel\Tests;
 
 use Jiannei\Response\Laravel\Support\Facades\Response;
@@ -12,7 +21,7 @@ public function testAddExtraField()
 
         $this->assertEquals(200, $response->status());
 
-        $this->assertArrayHasKey('extra',$response->getData(true));
-        $this->assertArrayHasKey('time',$response->getData(true)['extra']);
+        $this->assertArrayHasKey('extra', $response->getData(true));
+        $this->assertArrayHasKey('time', $response->getData(true)['extra']);
     }
-}
\ No newline at end of file
+}
diff --git a/tests/Support/Format.php b/tests/Support/Format.php
index a91488c..f474e64 100644
--- a/tests/Support/Format.php
+++ b/tests/Support/Format.php
@@ -1,5 +1,14 @@
 <?php
 
+/*
+ * This file is part of the jiannei/laravel-response.
+ *
+ * (c) Jiannei <longjian.huang@foxmail.com>
+ *
+ * This source file is subject to the MIT license that is bundled
+ * with this source code in the file LICENSE.
+ */
+
 namespace Jiannei\Response\Laravel\Tests\Support;
 
 use Illuminate\Support\Facades\Config;
@@ -19,8 +28,8 @@ public function data(?array $data, ?string $message, int $code, $errors = null):
             'data' => $data ?: (object) $data,
             'error' => $errors ?: (object) [],
             'extra' => [
-                'time' => time()
+                'time' => time(),
             ],
         ], Config::get('response.format.fields', []));
     }
-}
\ No newline at end of file
+}
diff --git a/tests/TestCase.php b/tests/TestCase.php
index def7d77..d61fb8d 100644
--- a/tests/TestCase.php
+++ b/tests/TestCase.php
@@ -43,6 +43,6 @@ protected function defineEnvironment($app)
         ]);
 
         $app['config']->set('response.enum', \Jiannei\Response\Laravel\Tests\Repositories\Enums\ResponseCodeEnum::class);
-        $app['config']->set('response.format',\Jiannei\Response\Laravel\Tests\Support\Format::class);
+        $app['config']->set('response.format', \Jiannei\Response\Laravel\Tests\Support\Format::class);
     }
 }