diff --git a/compose.hub.yaml b/compose.hub.yaml
index d50b89e..af3eddf 100644
--- a/compose.hub.yaml
+++ b/compose.hub.yaml
@@ -12,6 +12,8 @@
 # Required in .env: APP_SECRET. Set MYSQL_* (or replace DATABASE_URL after editing this file) if you
 # use the bundled database. For TLS in front, set TRUSTED_PROXIES to include your reverse proxy CIDR.
 #
+# DEPLOY: copy THIS file + a .env to the server; do NOT reuse the imwald compose.hub.yaml.
+# This file has name: gitcitadel (→ containers gitcitadel-php-1 etc.), port 9085.
 # Host port: Apache proxies gitcitadel.imwald.eu → 127.0.0.1:9085. HTTP_PUBLISH is set in .env.
 #
 # Build & push (on your machine or CI), e.g.: