add hint for single run redeploy

README.md

@@ -42,4 +42,8 @@ Somtimes it is need to redeploy a runner (with other token e.g.). in this case y
 RUNNER_REDEPLOY: true
 ```
 Hint: should remove after usage!
+Hint 2: you can use --extra-vars in command for sinlge use:
+```bash
+ansible-playbook playbooks/git-runners.yml -l runnerhost --extra-vars '{"RUNNER_REDEPLOY": true}'
+```
 With this option ansible delete the `.runner` file. Without this file ansible do a new registration for this runner.