diff --git a/docker-compose-prod.yml b/docker-compose-prod.yml
index cc93b85..f87a1ba 100644
--- a/docker-compose-prod.yml
+++ b/docker-compose-prod.yml
@@ -23,6 +23,11 @@ services:
       retries: 3
       start_period: 40s
 
+# Bereits angelegtes/importiertes Volume nutzen (vermeidet die Compose-Warnung
+# "already exists but was not created by Docker Compose").
+# Neuinstallation: zuerst `docker volume create beauty-bookings_storage-data`
+# (Name = <Projektordner>_storage-data, hier: beauty-bookings).
 volumes:
   storage-data:
-    driver: local
+    name: beauty-bookings_storage-data
+    external: true