diff --git a/Lib/idlelib/__init__.py b/Lib/idlelib/__init__.py
index 7a83ddea76c..711f61bb692 100644
--- a/Lib/idlelib/__init__.py
+++ b/Lib/idlelib/__init__.py
@@ -1 +1,8 @@
-# Dummy file to make this a package.
+"""The idlelib package implements the Idle application.
+
+Idle includes an interactive shell and editor.
+Use the files named idle.* to start Idle.
+
+The other files are private implementations.  Their details are subject to
+change.  See PEP 434 for more.  Import them at your own risk.
+"""