diff --git a/IPython/terminal/shortcuts/auto_match.py b/IPython/terminal/shortcuts/auto_match.py
index bb0ca8b..c29f97a 100644
--- a/IPython/terminal/shortcuts/auto_match.py
+++ b/IPython/terminal/shortcuts/auto_match.py
@@ -1,3 +1,9 @@
+"""
+Utilities function for keybinding with prompt toolkit. 
+
+This will be bound to specific key press and filter modes, 
+like whether we are in edit mode, and whether the completer is open.
+"""
 import re
 from prompt_toolkit.key_binding import KeyPressEvent