diff --git a/apps/backend/.env b/apps/backend/.env
index 72476a6c5..282ee9da2 100644
--- a/apps/backend/.env
+++ b/apps/backend/.env
@@ -51,7 +51,7 @@ STACK_SVIX_SERVER_URL=# For prod, leave it empty. For local development, use `ht
 STACK_SVIX_API_KEY=# enter the API key for the Svix webhook service here. Use `eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJpYXQiOjE2NTUxNDA2MzksImV4cCI6MTk3MDUwMDYzOSwibmJmIjoxNjU1MTQwNjM5LCJpc3MiOiJzdml4LXNlcnZlciIsInN1YiI6Im9yZ18yM3JiOFlkR3FNVDBxSXpwZ0d3ZFhmSGlyTXUifQ.En8w77ZJWbd0qrMlHHupHUB-4cx17RfzFykseg95SUk` for local development
 
 # S3
-STACK_S3_ENDPOINT=
+STACK_S3_ENDPOINT=# S3 endpoint URL (e.g., 'https://s3.amazonaws.com' for AWS or custom endpoint for S3-compatible services)
 STACK_S3_REGION=
 STACK_S3_ACCESS_KEY_ID=
 STACK_S3_SECRET_ACCESS_KEY=