diff --git a/.env.sample b/.env.sample
index 6703508..1ed981f 100644
--- a/.env.sample
+++ b/.env.sample
@@ -2,6 +2,8 @@ TYPE=karrot
 
 DOMAIN=karrot.example.com
 
+COMPOSE_FILE="compose.yml"
+
 SITE_NAME=karrot dev
 SITE_LOGO=https://user-images.githubusercontent.com/31616/36565633-517373a4-1821-11e8-9948-5bf6887c667e.png