Update readme

README.md

@@ -2,9 +2,9 @@
 
 A -- very simple -- Ansible playbook that adds a new local user to `utility[\d+].dev.gap.geant.org`, such that a user can log in and provision a new development VM using Terraform.
 
-Example usage of this playbook:
+Example usage of this playbook (become root):
 ```
-ansible-playbook -i localhost, --connection=local playbook.yml -e "username=$USERNAME" -e "full_name=$YOUR_NAME" -e "ssh_key=$SSH_PUB_KEY" -k
+ansible-playbook -i localhost, --connection=local playbook.yml 
 ```
 
 Remember to fill in the variables `$USERNAME`, `$YOUR_NAME`, and `$SSH_PUB_KEY`.