update readme

README.md

@@ -30,17 +30,20 @@ Tested on Windows with Node v8.9.1 and puppeteer v0.13.0
 - Clone this repository. `git clone https://github.com/sarfraznawaz2005/whatspup.git`
 - Type `npm install`
 - Type `node chat.js USERNAME` (case-sensitive)
-- Chrome will open up, now just scan Whatsapp QR Code once
+- Chrome will open up, now just scan Whatsapp QR Code once via whatsapp app in your mobile
 - Wait for connection and start typing your messages :smile:
 
+
+**NOTE:** Once you have connected by scanning QR code, your session will be saved so you won't have to scan it again and again unless you revoke from whatsapp app or by deleting **tmp** folder. 
+
 ## Commands ##
 
 **Changing User**
 
 You can switch chat with another user anytime by typing on console:
 `--chat USERNAME` (case-sensitive)
 
-NOTE: `USERNAME` is supposed to be a person with whom you have already initiated a conversation in whatsapp. In other words, we use a selector to click that user's name from conversations list.
+**NOTE:** `USERNAME` is supposed to be a person with whom you have already initiated a conversation in whatsapp. In other words, we use a selector to click that user's name from conversations list.
 
 If `USERNAME` contains space, you should specify it in double quotes instead like `--chat "Foo Bar"`