diff --git a/Sandstorm.md b/Sandstorm.md
index 01bbbf4..fec7615 100644
--- a/Sandstorm.md
+++ b/Sandstorm.md
@@ -16,6 +16,7 @@ DNS records:
 ```
 Caddyfile, proxy to KVM VM that is running Debian and Sandstorm:
 ```
+# Full domain where Sandstorm login is. Not subdomain. Not sub-url.
 *.example.com example.com {
         tls {
                 load /etc/caddy/certs