diff --git a/butterfly/__about__.py b/butterfly/__about__.py
index caff856..12ad867 100644
--- a/butterfly/__about__.py
+++ b/butterfly/__about__.py
@@ -8,3 +8,8 @@ __email__ = "paradoxxx.zero@gmail.com"
 
 __license__ = "GPLv3"
 __copyright__ = "Copyright 2017 %s" % __author__
+
+__all__ = [
+    '__title__', '__version__', '__summary__', '__uri__', '__author__',
+    '__email__', '__license__', '__copyright__'
+]