diff --git a/src/calibre/utils/coffeescript.py b/src/calibre/utils/coffeescript.py
index 75188978c8..a1c7993ec1 100644
--- a/src/calibre/utils/coffeescript.py
+++ b/src/calibre/utils/coffeescript.py
@@ -8,8 +8,11 @@ __copyright__ = '2011, Kovid Goyal <kovid@kovidgoyal.net>'
 __docformat__ = 'restructuredtext en'
 
 '''
-Utilities to help with developing coffeescript based apps
+Utilities to help with developing coffeescript based apps.
+A coffeescript compiler and a simple web server that automatically serves
+coffeescript files as javascript.
 '''
+
 import time, SimpleHTTPServer, SocketServer, os, bz2, sys
 from io import BytesIO