diff --git a/.envrc.sample b/.envrc.sample
index 10885c3..5094813 100644
--- a/.envrc.sample
+++ b/.envrc.sample
@@ -1,4 +1,6 @@
 export DOMAIN=wordpress.example.com
+## Domain aliases
+#export EXTRA_DOMAINS=', `www.wordpress.example.com`'
 
 export STACK_NAME=wordpress
 export LETS_ENCRYPT_ENV=production
diff --git a/README.md b/README.md
index d412698..68c9d62 100644
--- a/README.md
+++ b/README.md
@@ -15,7 +15,6 @@ Coöp Cloud + [Wordpress](https://wordpress.org) = 🥳
    abra secret_generate db_password v1
    abra secret_generate db_root_password v1
    ```
-
 7. `abra deploy`
 8. Open the configured domain in your browser to finish set-up
 9. `abra run wordpress chown www-data:www-data /var/www/html/wp-content` to fix
diff --git a/compose.yml b/compose.yml
index 7a06f0e..413ef1e 100644
--- a/compose.yml
+++ b/compose.yml
@@ -34,7 +34,7 @@ services:
         - "traefik.docker.network=proxy"
         - "traefik.http.routers.${STACK_NAME}.tls=true"
         - "traefik.http.services.${STACK_NAME}.loadbalancer.server.port=80"
-        - "traefik.http.routers.${STACK_NAME}.rule=Host(`ch.${DOMAIN}`, `${DOMAIN}`)"
+        - "traefik.http.routers.${STACK_NAME}.rule=Host(`${DOMAIN}`${EXTRA_DOMAINS})"
         # 3wc: this rule works for routing, but not for generating certificates
         # see https://git.autonomic.zone/compose-stacks/planning/issues/14
         #- "traefik.http.routers.${STACK_NAME}.rule=HostRegexp(`{subdomain:.+}.${DOMAIN}`, `${DOMAIN}`)"