Readme scripts usage fix
## Restore from backup
To start the cluster from the backup
1. Make sure the cluster is not running
-2. Locate directory you want to restore from on the backup volume, e.g. `cluster1-pxc-nodes-2018-12-28-18-29`. Use `list-backups.sh` to get list of backups
-3. Run `restore-backup.sh`
\ No newline at end of file
+2. Locate directory you want to restore from on the backup volume, e.g. `cluster1-pxc-nodes-2018-12-28-18-29`. Use `list-backups.sh -v <backup PVC>` to get list of backups
+3. Run `restore-backup.sh -d <backup dir> -v <backup PVC> -r <restore PVC>`
\ No newline at end of file
