README.md in getch-0.0.1 vs README.md in getch-0.0.2

@@ -1,6 +1,24 @@
 # Getch
-A script to install Gentoo.
+A CLI tool to install Gentoo.
 
-# Install
+## Install
+Getch is cryptographically signed, so add my public key (if you haven’t already) as a trusted certificate.  
+With `gem` installed:
 
+    $ gem cert --add <(curl -Ls https://raw.githubusercontent.com/szorfein/getch/master/certs/szorfein.pem)
+
+    $ gem install getch -P HighSecurity
+
+When you boot from an `iso`, you can install `ruby`, `getch` and correct your `PATH=` directly with the `bin/setup.sh`:
+
     # curl https://raw.githubusercontent.com/szorfein/getch/master/bin/setup.sh | sh
+    # source ~/.zshrc # or ~/.bashrc
+
+## Usage
+
+    $ getch -h
+
+## Examples
+For a french user:
+
+    # getch --username ninja --zoneinfo Europe/Paris --language fr_FR --keyboard fr