diff --git a/.env.sample b/.env.sample
index c541e7b..c3ca441 100644
--- a/.env.sample
+++ b/.env.sample
@@ -1,2 +1,3 @@
 DATABASE_URL=data.db
-DATABASE_TYPE=sqlite
\ No newline at end of file
+DATABASE_TYPE=sqlite
+CUSTOM_ACCESS_TOKEN_SCRIPT="function(user,tokenPayload){var data = tokenPayload;data.extra = {'x-extra-id': user.id};return data;}"
\ No newline at end of file