diff --git a/Packaging.md b/Packaging.md
index 1841f60..05e10ea 100644
--- a/Packaging.md
+++ b/Packaging.md
@@ -77,7 +77,7 @@ For libraries that Tahoe-LAFS uses, we have these desiderata:
 
 ## setuptools
 
-We use a Python packaging tool named [setuptools](http://cheeseshop.python.org/pypi/setuptools).
+We use a Python packaging tool named [setuptools](http://pypi.python.org/pypi/setuptools) (actually a fork of it named [zetuptoolz](http://tahoe-lafs.org/trac/zetuptoolz)).
 
 Advantages: