diff --git a/README.md b/README.md
index 2c9d034..91efa55 100644
--- a/README.md
+++ b/README.md
@@ -48,6 +48,27 @@ Writing messages with extra data:
 ], 'category');
 ```
 
+### Extra callback
+
+`extraCallback` property can modify extra's data as callable function
+ 
+```php
+    'targets' => [
+        [
+            'class' => 'notamedia\sentry\SentryTarget',
+            'dsn' => 'http://2682ybvhbs347:235vvgy465346@sentry.com/1',
+            'levels' => ['error', 'warning'],
+            'context' => true // Write the context information. The default is true.
+            'extraCallback' => function($context, $extra) {
+                // some manipulation with data
+                $extra['some_data'] = \Yii::$app->someComponent->someMethod();
+                return $extra;
+            }
+        ],
+    ],
+```
+
+
 ## Log levels
 
 Yii2 log levels converts to Sentry levels:
diff --git a/SentryTarget.php b/SentryTarget.php
index 478ed26..c8feeac 100644
--- a/SentryTarget.php
+++ b/SentryTarget.php
@@ -12,7 +12,7 @@
 
 /**
  * SentryTarget records log messages in a Sentry.
- * 
+ *
  * @see https://getsentry.com
  */
 class SentryTarget extends Target
@@ -29,11 +29,15 @@ class SentryTarget extends Target
      * @var bool Write the context information. The default implementation will dump user information, system variables, etc.
      */
     public $context = true;
+    /**
+     * @var callable Callback function that can modify extra's array
+     */
+    public $extraCallback;
     /**
      * @var \Raven_Client
      */
     protected $client;
-    
+
     /**
      * {@inheritdoc}
      */
@@ -42,7 +46,7 @@ public function collect($messages, $final)
         if (!isset($this->client)) {
             $this->client = new \Raven_Client($this->dsn, $this->clientOptions);
         }
-        
+
         parent::collect($messages, $final);
     }
 
@@ -78,6 +82,10 @@ public function export()
                 $extra['context'] = parent::getContextMessage();
             }
 
+            if (is_callable($this->extraCallback)) {
+                $extra = call_user_func($this->extraCallback, $context, $extra);
+            }
+
             $data = [
                 'level' => static::getLevelName($level),
                 'timestamp' => $timestamp,
@@ -94,7 +102,7 @@ public function export()
 
     /**
      * Returns the text display of the specified level for the Sentry.
-     * 
+     *
      * @param integer $level The message level, e.g. [[LEVEL_ERROR]], [[LEVEL_WARNING]].
      * @return string
      */