diff --git a/docs/src/runbooks/set-up-a-new-host.md b/docs/src/runbooks/set-up-a-new-host.md
index 7ce6d3fe..8e7d7031 100644
--- a/docs/src/runbooks/set-up-a-new-host.md
+++ b/docs/src/runbooks/set-up-a-new-host.md
@@ -98,7 +98,7 @@ Optional: Configure secrets
 After first boot, generate an age public key from the host SSH key:
 
 ```bash
-nix-shell -p ssh-to-age --run 'ssh-keyscan <hostname>.barrucadu.co.uk | ssh-to-age'
+nix-shell -p ssh-to-age --run 'ssh-keyscan localhost | ssh-to-age'
 ```
 
 Add a new section with this key to `.sops.yaml`: