diff --git a/demo/Structural/DependencyInjection/DatabaseConnection.php b/demo/Structural/DependencyInjection/DatabaseConnection.php
index 14bb7bb..7c78c57 100644
--- a/demo/Structural/DependencyInjection/DatabaseConnection.php
+++ b/demo/Structural/DependencyInjection/DatabaseConnection.php
@@ -13,6 +13,8 @@ class DatabaseConnection
     private $configuration;
     
     /**
+     * 通过依赖注入形式 将 DatabaseConfiguration 注入
+     *
      * @param DatabaseConfiguration $config
      */
     public function __construct(DatabaseConfiguration $config)