diff --git a/README.md b/README.md
index b437139..515d6c2 100644
--- a/README.md
+++ b/README.md
@@ -2,22 +2,35 @@
 
 Recipe to build [`gaomd/ikev2-vpn-server`](https://registry.hub.docker.com/u/gaomd/ikev2-vpn-server/) Docker image.
 
-## 1. Start the IKEv2 VPN Server
+## Usage
+
+### 1. Start the IKEv2 VPN Server
 
     docker run -d --name ikev2-vpn-server --privileged -p 500:500/udp -p 4500:4500/udp gaomd/ikev2-vpn-server:0.2.2
 
-## 2. Generate a .mobileconfig file for iOS / OS X
-
-*Replace `vpn1.example.com` with your own domain name and make sure it resolves to you server's IP address.*
+### 2. Generate the .mobileconfig (for iOS / OS X)
 
     docker run -i -t --rm --volumes-from ikev2-vpn-server -e "HOST=vpn1.example.com" gaomd/ikev2-vpn-server:0.2.2 generate-mobileconfig > ikev2-vpn.mobileconfig
 
-This command generates an `ikev2-vpn.mobileconfig` file, transfer it to your local computer via SSH tunnel (`scp`) or any other secure methods.
+*Be sure to replace `vpn1.example.com` with your own domain name and resolve it to you server's IP address. Simply put an IP address is supported as well (and enjoy an even faster handshake speed).*
 
-## 3. Install .mobileconfig
+Transfer the generated `ikev2-vpn.mobileconfig` file to your local computer via SSH tunnel (`scp`) or any other secure methods.
+
+### 3. Install the .mobileconfig (for iOS / OS X)
 
 - **iOS 9 or later**: AirDrop the `.mobileconfig` file to your iOS 9 device, finish the **Install Profile** screen;
-- **iOS 8 or later**: Send an E-mail to your iOS device with the `.mobileconfig` file as attachment, then tap the attachment to bring up then finish the **Install Profile** screen;
+
 - **OS X 10.11 El Capitan or later**: Double click the `.mobileconfig` file to start the *profile installation* wizard.
 
-*IKEv2 protocol requires iOS 8 or later, Mac OS X 10.11 El Capitan is supported as well.*
+## Technical Details
+
+Upon container creation, a single *shared secrets* was generated for authentication purpose, zero *certificate*, zero *username+password combination*, simple life.
+
+## License
+
+Copyright (c) 2016 Mengdi Gao, This software is licensed under the [MIT License](LICENSE).
+
+---
+
+\* *IKEv2 protocol requires iOS 8 or later, Mac OS X 10.11 El Capitan is supported as well.*
+\* Install for **iOS 8 or later** or when your AirDrop fails: Send an E-mail to your iOS device with the `.mobileconfig` file as attachment, then tap the attachment to bring up then finish the **Install Profile** screen;