diff --git a/.env.sample b/.env.sample
index df0a30c..0292165 100644
--- a/.env.sample
+++ b/.env.sample
@@ -6,3 +6,8 @@ LETS_ENCRYPT_ENV=production
 DOCKER_MODS="linuxserver/calibre-web:calibre"
 OAUTHLIB_RELAX_TOKEN_SCOPE=1
 TZ="Europe/London"
+
+DEBUG=False
+
+# oauth2 support
+COMPOSE_FILE="compose.yml:compose.oauth2.yml"
diff --git a/compose.yml b/compose.yml
index d234fb8..498d1be 100644
--- a/compose.yml
+++ b/compose.yml
@@ -10,6 +10,7 @@ services:
       - PGID=1000
       - PUID=1000
       - TZ
+      - FLASK_DEBUG=${DEBUG}
     volumes:
       - config:/config
       - books:/books