diff --git a/README.md b/README.md
index c2ea5a2..2eb7c16 100644
--- a/README.md
+++ b/README.md
@@ -8,19 +8,21 @@
 2. 增加单元测试，优化依赖。
 3. 规范代码编写，简洁了源代码中一些不规范，重复高的代码。
 
-# hyperf mongodb pool
+# 使用
 
+## 设置仓库源
 ```
-## step 1
+
 {
   "repositories": [{
     "type": "composer",
     "url": "http://composer.zyimm.com"
   }]
 }
+```
+## 安装
 
-## step 2
-
+```
 composer require zyimm/hyperf-mongodb
 ```
 
diff --git a/src/Mongodb.php b/src/Mongodb.php
index 8f5ca17..1b24822 100644
--- a/src/Mongodb.php
+++ b/src/Mongodb.php
@@ -27,6 +27,11 @@ class Mongodb
      */
     protected $poolName = 'default';
 
+    /**
+     * Mongodb
+     *
+     * @param  PoolFactory  $factory
+     */
     public function __construct(PoolFactory $factory)
     {
         $this->factory = $factory;
@@ -79,6 +84,8 @@ class Mongodb
     }
 
     /**
+     * getContextKey
+     *
      * The key to identify the connection object in coroutine context.
      */
     private function getContextKey(): string