README.en.md in rakuten_web_service-0.6.2 vs README.en.md in rakuten_web_service-0.6.3

@@ -47,24 +47,31 @@
 * [Rakuten Kobo Ebook Search API](http://webservice.rakuten.co.jp/api/koboebooksearch/)
 * [Rakuten Kobo Genre Search API](http://webservice.rakuten.co.jp/api/kobogenresearch/)
 
 ## Usage
 
+### Prerequisite: Getting Application ID
+
+You need to get Application ID for your application to access to Rakuten Web Service APIs. 
+If you have not got it, register your appplication [here](https://webservice.rakuten.co.jp/app/create). 
+
 ### Configuration
 
 `RakutenWebService.configuration` allows you to specify your application's key called application\_id and your affiliate id(optional).
 
 ```ruby
   RakutenWebService.configuration do |c|
-    c.application_id = YOUR_APPLICATION_ID
-    c.affiliate_id = YOUR_AFFILIATE_ID
+    c.application_id = 'YOUR_APPLICATION_ID'
+    c.affiliate_id = 'YOUR_AFFILIATE_ID'
   end
 ```
 
+Please note that you neet to replace `'YOUR_APPLICATION_ID'` and `'YOUR_AFFILIATE_ID'` with actual ones you have.
+
 ### Search Ichiba Items
 
 ```ruby
-  items = RakutenWebService::Ichiba::Item.search(:keyword => 'Ruby') # This returns Enamerable object
+  items = RakutenWebService::Ichiba::Item.search(:keyword => 'Ruby') # This returns Enumerable object
   items.first(10).each do |item|
     puts "#{item['itemName']}, #{item.price} yen" # You can refer to values as well as Hash.
   end
 ```