better usage example

README.md

@@ -4,32 +4,47 @@ Generate customized Debian ISO images for automatic deployments.
 
 ## Usage
 
-Run `build.sh` to generate a hands-free iso image.
+Run `build.sh` to generate a hands-free ISO image.
 
 ```
 ./build.sh [-u username] [-p password] [-n hostname] [-d domain] [-a package] [-i iso_url] [-s sign_key] [-o path] [-v] [-h]
 ```
 
 ### Requirements
 
-The following command installs all requirements to use the tool on a Debian based system:
+The following command installs all requirements to build an ISO image on a Debian based system:
 
 ```sh
 sudo apt update
 sudo apt install curl git gnupg pwgen whois xorriso
 ```
 
-### Example
+### Clone repo
+
+Clone this repository and `cd` into it.
 
 ```sh
 git clone https://github.com/nothub/debian-autoinstall.git
 cd debian-autoinstall
-# customize authorized ssh keys
+```
+
+### SSH keys
+
+To include SSH keys for remote access, add them to the `configs/authorized_keys` file.
+
+```sh
 curl -sSLo configs/authorized_keys https://github.com/nothub.keys
+echo "ssh-ed25519 AAAA... foo" >> configs/authorized_keys
+echo "ssh-ed25519 AAAA... bar" >> configs/authorized_keys
+```
+
+### Build ISO
+
+```sh
 # set user and password
 ./build.sh -u 'hub' -p 'changeme'
 # set hostname and domain
-./build.sh -n 'calculon' -d 'home.arpa'
+./build.sh -n 'calculon' -d 'example.org'
 # include additional apt packages
 ./build.sh -a 'strace' -a 'unattended-upgrades'
 ```