diff --git a/README.md b/README.md
index 01577e0..6e2795b 100644
--- a/README.md
+++ b/README.md
@@ -27,7 +27,8 @@ starwood.search({
 Response JSON would like this:
 
 ```js
-{ id: '3482',
+{ 
+  id: '3482',
   thumbnail: '/pub/media/3482/str3482po.134187_md.jpg',
   name: '三亚亚龙湾瑞吉度假酒店',
   country: '中国,',
diff --git a/lib/apis.js b/lib/apis.js
index 3044924..df6b943 100644
--- a/lib/apis.js
+++ b/lib/apis.js
@@ -3,8 +3,12 @@ var debug = require('debug')('starwood');
 var trim = require('trim');
 var utils = require('./utils');
 
+// Request host
 exports.host = 'https://www.starwoodhotels.com/';
 
+// Request rules, contains request.headers
+// `all` means this kind of rule will be append to request's option
+// in both `GET`, `POST` ,`PUT`, `DELETE` methods.
 exports.rules = {
   all: {
     headers: {