diff --git a/src/BusinessWorker.php b/src/BusinessWorker.php
index 43f4a8d..10627ac 100644
--- a/src/BusinessWorker.php
+++ b/src/BusinessWorker.php
@@ -1,4 +1,5 @@
 <?php
+
 /**
  * This file is part of workerman.
  *
@@ -61,7 +62,7 @@ class BusinessWorker extends Worker
     /**
      * 业务超时时间，可用来定位程序卡在哪里
      *
-     * @var callable
+     * @var callable|null
      */
     public $processTimeoutHandler = '\\Workerman\\Worker::log';
     
@@ -82,21 +83,21 @@ class BusinessWorker extends Worker
     /**
      * 保存用户设置的 worker 启动回调
      *
-     * @var callback
+     * @var callable|null
      */
     protected $_onWorkerStart = null;
 
     /**
      * 保存用户设置的 workerReload 回调
      *
-     * @var callback
+     * @var callable|null
      */
     protected $_onWorkerReload = null;
     
     /**
      * 保存用户设置的 workerStop 回调
      *
-     * @var callback
+     * @var callable|null
      */
     protected $_onWorkerStop= null;
 
@@ -131,21 +132,21 @@ class BusinessWorker extends Worker
     /**
      * Event::onConnect 回调
      *
-     * @var callback
+     * @var callable|null
      */
     protected $_eventOnConnect = null;
 
     /**
      * Event::onMessage 回调
      *
-     * @var callback
+     * @var callable|null
      */
     protected $_eventOnMessage = null;
 
     /**
      * Event::onClose 回调
      *
-     * @var callback
+     * @var callable|null
      */
     protected $_eventOnClose = null;
 
diff --git a/src/Gateway.php b/src/Gateway.php
index 2c93aa5..168500c 100644
--- a/src/Gateway.php
+++ b/src/Gateway.php
@@ -1,4 +1,5 @@
 <?php
+
 /**
  * This file is part of workerman.
  *
@@ -107,7 +108,7 @@ class Gateway extends Worker
     /**
      * 路由函数
      *
-     * @var callback
+     * @var callable|null
      */
     public $router = null;
 
@@ -136,14 +137,14 @@ class Gateway extends Worker
     /**
      * BusinessWorker 连接成功之后触发
      *
-     * @var callback|null
+     * @var callable|null
      */
     public $onBusinessWorkerConnected = null;
 
     /**
      * BusinessWorker 关闭时触发
      *
-     * @var callback|null
+     * @var callable|null
      */
     public $onBusinessWorkerClose = null;
 
@@ -183,35 +184,35 @@ class Gateway extends Worker
     /**
      * 当 worker 启动时
      *
-     * @var callback
+     * @var callable|null
      */
     protected $_onWorkerStart = null;
 
     /**
      * 当有客户端连接时
      *
-     * @var callback
+     * @var callable|null
      */
     protected $_onConnect = null;
 
     /**
      * 当客户端发来消息时
      *
-     * @var callback
+     * @var callable|null
      */
     protected $_onMessage = null;
 
     /**
      * 当客户端连接关闭时
      *
-     * @var callback
+     * @var callable|null
      */
     protected $_onClose = null;
 
     /**
      * 当 worker 停止时
      *
-     * @var callback
+     * @var callable|null
      */
     protected $_onWorkerStop = null;