diff --git a/docker-compose.yml b/docker-compose.yml
index 33fee49..f45d265 100644
--- a/docker-compose.yml
+++ b/docker-compose.yml
@@ -10,7 +10,7 @@ services:
     environment:
       - WATCHTOWER_NOTIFICATION_SLACK_CHANNEL=#alerts
       - WATCHTOWER_NOTIFICATION_SLACK_HOOK_URL=https://hooks.slack.com/services/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
-#      - WATCHTOWER_NOTIFICATION_SLACK_IDENTIFIER=
+      - WATCHTOWER_NOTIFICATION_SLACK_IDENTIFIER=${WATCHTOWER_NOTIFICATION_SLACK_IDENTIFIER}
       - WATCHTOWER_NOTIFICATIONS=slack
       - WATCHTOWER_POLL_INTERVAL=60
       - WATCHTOWER_RUN_ONCE=false