diff --git a/README.md b/README.md
index fe49990..b52d4d2 100644
--- a/README.md
+++ b/README.md
@@ -276,6 +276,15 @@ make deploy                     # flyctl deploy --remote-only
 `make deploy-status` shows machine and health-check state.  The app serves
 the SPA at `https://<app>.fly.dev/` with `/api/health` as the health check.
 
+Machine placement is imperative rather than part of `fly.toml`; the current
+production topology is one machine in Sydney and one in Virginia:
+
+```sh
+flyctl scale count 2 --region syd,iad
+```
+
+`flyctl deploy` preserves existing machines and regions on redeploys.
+
 ### Continuous deployment
 
 `.gitea/workflows/deploy.yml` deploys on any `v*` tag push (or manual