diff --git a/debian/copyright b/debian/copyright
index fce92c3..9563dfc 100644
--- a/debian/copyright
+++ b/debian/copyright
@@ -1,4 +1,13 @@
 Format: http://www.debian.org/doc/packaging-manuals/copyright-format/1.0/
+Upstream-Name: cached-property
+Upstream-Contact: Daniel Greenfeld <pydanny@gmail.com>
+Source: https://github.com/pydanny/cached-property
+    The pristine upstream source fails to clean with python 3.4 in the
+    usual build process (python3.4 setup.py clean). Since at this early stage
+    quilt patches are not yet applied, the upstream tar ball has to be patched
+    to work with python 3.4.
+    Issue: https://github.com/pydanny/cached-property/issues/22
+    Fix: https://github.com/mbehrle/cached-property/commit/e75addd999cdd702675fdb27c9eaefe51fe68e06
 
 Files: *
 Copyright: 2015 Daniel Greenfeld