diff --git a/TODO.on.site b/TODO.on.site
index e9ae803..56a0960 100644
--- a/TODO.on.site
+++ b/TODO.on.site
@@ -21,6 +21,7 @@
 * Add account or alias for 'postmaster@'
 
 When the containers are up run `certbot`:
+* Make sure to set SA_DOMAIN_CONTACT in `environment`
 * Once `docker-compose -f sa-certbot.yml run new`
 * Every x < 30 days `docker-compose -f sa-certbot.yml run renew`
 * Always reload nginx `docker-compose exec nginx nginx -s reload`