diff --git a/examples/usecase/__init__.py b/examples/usecase/__init__.py
index 139597f9cb07c5d48bed18984ec4747f4b4f3438..222cd12d6696ba4aad531f80bc8bd9d278f7e276 100644
--- a/examples/usecase/__init__.py
+++ b/examples/usecase/__init__.py
@@ -1,2 +1,5 @@
-
+# -*- coding: utf-8 -*-
+"""
+init file 
+"""