diff --git a/docs/build.md b/docs/build.md
index 8537c2d6..5ed7c03f 100644
--- a/docs/build.md
+++ b/docs/build.md
@@ -3,10 +3,18 @@
 ## Development
 
 We use Webpack HMR to develop Boostnote.
-You can use this command to use our configuration
+You can use following commands to use default configuration at the top of project directory.
+
+Install requirement packages.
 
 ```
-npm run webpack
+$ npm install
+```
+
+Build codes.
+
+```
+$ npm run webpack
 ```
 
 After a few seconds, you will see this message.
@@ -17,9 +25,9 @@ webpack: bundle is now VALID.
 
 Then, we have to run the app.
 ```
-npm run hot
+$ npm run hot
 ```
-> Actually the app can be start with `npm start@. However, the app will use the compiled script.
+> Actually the app can be start with `npm start`. However, the app will use the compiled script.
 
 By this, webpack will watch the code changes and apply it automatically.
 
diff --git a/oh-my-cdn.json b/oh-my-cdn.json
index d149896b..ddf602c5 100644
--- a/oh-my-cdn.json
+++ b/oh-my-cdn.json
@@ -4,7 +4,7 @@
     "react": "https://cdnjs.cloudflare.com/ajax/libs/react/15.0.2/react.js",
     "react-dom": "https://cdnjs.cloudflare.com/ajax/libs/react/15.0.2/react-dom.js",
     "redux": "https://cdnjs.cloudflare.com/ajax/libs/redux/3.5.2/redux.js",
-    "react-redux": "https://npmcdn.com/react-redux@4.4.5/dist/react-redux.min.js",
+    "react-redux": "https://unpkg.com/react-redux@4.4.5/dist/react-redux.min.js"
     "katex": "https://cdnjs.cloudflare.com/ajax/libs/KaTeX/0.6.0/katex.min.js",
     "katex-style": "https://cdnjs.cloudflare.com/ajax/libs/KaTeX/0.6.0/katex.min.css"
   }