diff --git a/doc/raketasks/backup_restore.md b/doc/raketasks/backup_restore.md
index 2e41fad89e7..bfef975024f 100644
--- a/doc/raketasks/backup_restore.md
+++ b/doc/raketasks/backup_restore.md
@@ -162,6 +162,7 @@ Options:
 
 ```
 BACKUP=timestamp_of_backup (required if more than one backup exists)
+force=yes (do not ask if the authorized_keys file should get regenerated)
 ```
 
 Example output: