diff --git a/.env.example b/.env.example
index e43a094..a757916 100644
--- a/.env.example
+++ b/.env.example
@@ -24,7 +24,7 @@ AUTHENTIK_CLIENT_SECRET=your-client-secret
 TRAEFIK_NETWORK=traefik
 TRAEFIK_ENTRYPOINT=websecure
 TRAEFIK_CERT_RESOLVER=letsencrypt
-TOOL_SUBDOMAIN_PATTERN={tool}-{project}-{user}.tools.${ROOT_DOMAIN}
+TOOL_SUBDOMAIN_PATTERN={tool}-{project}-{user}.tools.localhost
 
 # Secrets (generate strong random values for production)
 SECRET_ENCRYPTION_KEY=change-me-in-production