Update README.md

README.md

@@ -92,6 +92,7 @@ Java客户端不依赖任何框架，能够运行于所有Java运行时环境，
 # Presentation
   * [携程开源配置中心Apollo的设计与实现](http://www.itdks.com/dakalive/detail/3420)
   * [Slides](http://techshow.ctrip.com/wp-content/uploads/2017/08/%E5%BC%80%E6%BA%90%E9%85%8D%E7%BD%AE%E4%B8%AD%E5%BF%83Apollo%E7%9A%84%E8%AE%BE%E8%AE%A1%E4%B8%8E%E5%AE%9E%E7%8E%B0-%E6%90%BA%E7%A8%8B%E5%AE%8B%E9%A1%BA.pdf)
+  * [详细介绍](http://www.infoq.com/cn/articles/open-source-configuration-center-apollo)
 
 # Support
 ![tech-support-qq](https://raw.githubusercontent.com/ctripcorp/apollo/master/doc/images/tech-support-qq.png)
@@ -105,7 +106,7 @@ The project is licensed under the [Apache 2 license](https://github.com/ctripcor
 
 # Known Users
 
-> 按照登记顺序排序，更多接入公司，欢迎在[https://github.com/ctripcorp/apollo/issues/451](https://github.com/ctripcorp/apollo/issues/451)登记
+> 按照登记顺序排序，更多接入公司，欢迎在[https://github.com/ctripcorp/apollo/issues/451](https://github.com/ctripcorp/apollo/issues/451)登记（仅供开源用户参考）
 
 ![携程](https://github.com/ctripcorp/apollo/blob/master/doc/images/known-users/ctrip.png) 
 ![青石证券](https://github.com/ctripcorp/apollo/blob/master/doc/images/known-users/bluestone.png)