diff --git a/src/calibre/gui2/viewer/footnote.py b/src/calibre/gui2/viewer/footnote.py
new file mode 100644
index 0000000000..8f7421ee3f
--- /dev/null
+++ b/src/calibre/gui2/viewer/footnote.py
@@ -0,0 +1,16 @@
+#!/usr/bin/env python
+# vim:fileencoding=utf-8
+from __future__ import (unicode_literals, division, absolute_import,
+                        print_function)
+
+__license__ = 'GPL v3'
+__copyright__ = '2014, Kovid Goyal <kovid at kovidgoyal.net>'
+
+class Footnotes(object):
+
+    def __init__(self):
+        self.clear()
+
+    def clear(self):
+        self.url_cache = {}
+