diff --git a/controller/.env.sample b/controller/.env.sample
index 1fa8178a..b5927f02 100644
--- a/controller/.env.sample
+++ b/controller/.env.sample
@@ -1,6 +1,8 @@
 # Path to the repository
 THYMIS_REPO_PATH=/var/lib/thymis/repository
-THYMIS_DATABASE_URL=sqlite:///var/lib/thymis/thymis.sqlite
+
+# Path to the database, see https://docs.sqlalchemy.org/en/20/core/engines.html#sqlite
+THYMIS_DATABASE_URL=sqlite:////var/lib/thymis/thymis.sqlite
 
 # Base URL for the application
 THYMIS_BASE_URL=http://localhost:8000