diff --git a/environment.template b/environment.template
index b435fa5..6641797 100644
--- a/environment.template
+++ b/environment.template
@@ -1,2 +1,5 @@
 # Set to public (sub)domain name
 SA_PUBLIC_DOMAIN_NAME=miau.local
+
+# Set to email address as responsible domain contact (used by certbot)
+# SA_DOMAIN_CONTACT=