diff --git a/.envrc.sample b/.envrc.sample
index 147781e..7559e5f 100644
--- a/.envrc.sample
+++ b/.envrc.sample
@@ -2,6 +2,8 @@ export SERVICE=adaptauthoring
 export STACK_NAME=adaptauthoring
 
 export DOMAIN=adapt.example.com
+## Domain aliases
+#export EXTRA_DOMAINS=', `www.adapt.example.com`'
 export LETS_ENCRYPT_ENV=production
 
 export ADMIN_EMAIL=adapt@example.com