diff --git a/README.md b/README.md
index 1279e3da43c35522f177262bdbf0f46d345fb8f1..fa5e1af0d35bea2f5b4d1afc80c7331c511dbac4 100644
--- a/README.md
+++ b/README.md
@@ -45,13 +45,13 @@ Notice that you need to wait a moment while bot trys to get the login QRCode fro
 
 After that, bot will be on duty. (roger-bot source can be found at [here](https://github.com/zixia/wechaty/blob/master/example/roger-bot.js))
 
-## 2. Advanced: 50 lines
-There's another basic usage demo bot named [ding-dong-bot](https://github.com/zixia/wechaty/blob/master/example/ding-dong-bot.js), who can reply _dong_ when bot receives a message _ding_.
+## 2. Advanced: dozens of lines
+Here's an chatbot [ding-dong-bot](https://github.com/zixia/wechaty/blob/master/example/ding-dong-bot.js) who can reply _dong_ when receives a message _ding_.
 
-## 3. Hardcore: 100 lines
-To Be Written.
+## 3. Hardcore: hundreds of lines
+Here's a chatbot [api-ai-bot](https://github.com/zixia/wechaty/blob/master/example/api-ai-bot.js), who can slightly understand NLP.
 
-Plan to glue with Machine Learning/Deep Learning/Neural Network/Natural Language Processing.
+Natual Language Understanding enabled by [api.AI](https://api.ai), you can get your module on api.AI by it's free plan.
 
 # Installation
 
diff --git a/src/puppet-web-bridge.js b/src/puppet-web-bridge.js
index be2fe549bc2d0a85eb0014df24cc64d9489e603d..98386669c54236736ffb9668385aff37c38e02f3 100644
--- a/src/puppet-web-bridge.js
+++ b/src/puppet-web-bridge.js
@@ -112,7 +112,7 @@ class Bridge {
       )
     ).toString('base64')
     // see: http://blog.sqrtthree.com/2015/08/29/utf8-to-b64/
-    const argsDecoded = `JSON.parse(decodeURIComponent(atob('${argsEncoded}')))`
+    const argsDecoded = `JSON.parse(decodeURIComponent(window.atob('${argsEncoded}')))`
 
     const wechatyScript   = `return (Wechaty && Wechaty.${wechatyFunc}.apply(undefined, ${argsDecoded}))`
     log.silly('Bridge', 'proxyWechaty: ' + wechatyScript)