diff --git a/README.md b/README.md
index 5b0d219..c8902e9 100644
--- a/README.md
+++ b/README.md
@@ -48,9 +48,10 @@
 ### javascript
 
 * [javascript 的 12 个怪癖](https://github.com/justjavac/12-javascript-quirks)
+* [JavaScript核心概念及实践](http://icodeit.org/jsccp/) (PDF)
 * [学用 JavaScript 设计模式](http://www.oschina.net/translate/learning-javascript-design-patterns)
 * [Node入门](http://www.nodebeginner.org/index-zh-cn.html)
-* [backbone.js入门教程](http://www.the5fire.com/backbone-js-tutorials-pdf-download.html) (pdf)
+* [backbone.js入门教程](http://www.the5fire.com/backbone-js-tutorials-pdf-download.html) (PDF)
 * [Backbone.js入门教程第二版](https://github.com/the5fire/backbonejs-learning-note)
 * [Developing Backbone.js Applications(中文版)](http://feliving.github.io/developing-backbone-applications)
 * [AngularJS中译本](https://github.com/basestyle/angularjs-cn)