__all__ for several more modules
diff --git a/Lib/pyclbr.py b/Lib/pyclbr.py
index b4e934b..c9bb2fe 100644
--- a/Lib/pyclbr.py
+++ b/Lib/pyclbr.py
@@ -59,6 +59,8 @@
 import re
 import string
 
+__all__ = ["readmodule"]
+
 TABWIDTH = 8
 
 _getnext = re.compile(r"""