diff --git a/obsidian-logic/watchtower/docker-compose.yml b/obsidian-logic/watchtower/docker-compose.yml
index 6bc7611..96455b2 100644
--- a/obsidian-logic/watchtower/docker-compose.yml
+++ b/obsidian-logic/watchtower/docker-compose.yml
@@ -26,7 +26,7 @@ services:
       WATCHTOWER_NOTIFICATION_EMAIL_SERVER_USER: ${WATCHTOWER_NOTIFICATION_EMAIL_SERVER_USER}
       WATCHTOWER_NOTIFICATION_EMAIL_SERVER_PASSWORD: ${WATCHTOWER_NOTIFICATION_EMAIL_SERVER_PASSWORD}
       WATCHTOWER_NOTIFICATION_EMAIL_DELAY: 3
-      WATCHTOWER_NOTIFICATION_EMAIL_SUBJECTTAG: obsidian
+      WATCHTOWER_NOTIFICATION_EMAIL_SUBJECTTAG: ${WATCHTOWER_NOTIFICATION_EMAIL_SUBJECTTAG}
 
     volumes:
     - /etc/timezone:/etc/timezone:ro