diff --git a/README.md b/README.md
index 0303352..47718ea 100644
--- a/README.md
+++ b/README.md
@@ -1,2 +1,76 @@
 # cf-dns-update-python
 Dynamic DNS record update utility for CloudFlare DNS service. Python implement
+
+### Requirements
+
+- Linux/macOS (tested with macOS 10.15.1 & Ubuntu 18.04)
+- Python 3 ( version >= 3.6 is recommended )
+
+### Download & Setup
+
+#### Download
+Download code from Release page. 
+
+Link here: [https://github.com/nhymxu/cf-dns-update-python/releases/latest](https://github.com/nhymxu/cf-dns-update-python/releases/latest)
+
+Or 
+
+clone repo using git:
+
+```shell
+git clone git@github.com:nhymxu/cf-dns-update-python.git
+```
+
+#### Create CloudFlare Token
+
+1. Go to CloudFlare dash
+2. Click open any domain you have
+3. Scroll to bottom, you can see **API** section from right column.
+4. Click `Get your API token`
+5. Click `Create Token`
+6. Enter Token name
+7. On `Permissions` section. Choose `Zone` - `DNS` - `Edit`
+8. On `Zone resource` section. Choose `Include` - `All zone` or specific zone you want.
+9. Click `Continue to Summary`
+10. Copy token display on page
+
+#### Setup CloudFlare Token
+
+Copy file `config.ini.sample` to current folder with name `config.ini`
+
+Add CloudFlare token to first section like this
+
+```ini
+[common]
+CF_API_TOKEN = token_key_here
+```
+
+#### Setup record to update
+
+1. Look at step **3** on section `Create CloudFlare Token`
+2. Copy `Zone ID`
+3. Add to `config.ini` like this:
+
+```ini
+[dungnt.net]
+zone_id = zone_id_here
+record = test.dungnt.net
+```
+
+### Auto running
+
+I want my script auto running every `x` minutes. So I need set up cronjob for it.
+
+From server shell, typing:
+
+```shell
+crontab -e
+```
+
+And add this line to end of file
+
+```text
+*/15 * * * * /opt/cf-dns-update-python/run.sh
+```
+
+This script will run each 15 minutes.
diff --git a/cf-dns-update.py b/cf-dns-update.py
index e8bdae0..332546a 100644
--- a/cf-dns-update.py
+++ b/cf-dns-update.py
@@ -1,3 +1,10 @@
+# -*- coding: utf-8 -*-
+
+"""
+Dynamic DNS record update utility for CloudFlare DNS service.
+(c) Dung Nguyen (nhymxu)
+"""
+
 import configparser
 import json
 import urllib.error
@@ -36,6 +43,14 @@ def get_local_ip():
     Get current public IP of server
     :return: string
     """
+
+    '''
+    Other domain can using to get IP:
+    ifconfig.me
+    icanhazip.com
+    ipecho.net/plain
+    ifconfig.co
+    '''
     endpoint = "https://checkip.amazonaws.com/"
 
     return make_request(url=endpoint).strip().decode('utf-8')