diff --git a/README.md b/README.md
index bcb0e39..b5f034f 100644
--- a/README.md
+++ b/README.md
@@ -11,6 +11,7 @@ Go语言圣经 [《The Go Programming Language》](http://gopl.io) 中文版本
 
 在线预览：
 
+- http://gopl-zh.simple-is-best.tk/
 - http://gopl-zh.b0.upaiyun.com/
 - http://docs.ruanjiadeng.com/gopl-zh/
 - http://shifei.me/gopl-zh/
diff --git a/preface.md b/preface.md
index 37b07d4..8671dea 100644
--- a/preface.md
+++ b/preface.md
@@ -11,13 +11,14 @@ Go语言圣经 [《The Go Programming Language》](http://gopl.io) 中文版本
 
 在线预览：
 
+- http://gopl-zh.simple-is-best.tk/
 - http://gopl-zh.b0.upaiyun.com/
 - http://docs.ruanjiadeng.com/gopl-zh/
 - http://shifei.me/gopl-zh/
 - http://2goo.info/media/html/gopl-zh-gh-pages/
 - http://docs.plhwin.com/gopl-zh/
-- http://gopl-zh.simple-is-best.tk/
 - https://docs.hacknode.org/gopl-zh/
+- http://books.studygolang.com/gopl-zh/
 
 {% include "./version.md" %}