diff --git a/setup.py b/setup.py
index 9195d5693..133e634a2 100644
--- a/setup.py
+++ b/setup.py
@@ -105,7 +105,7 @@ setup(name='allmydata-tahoe',
       author='Allmydata, Inc.',
       author_email='tahoe-dev@allmydata.org',
       url='http://allmydata.org/',
-      license='GNU GPL',
+      license='GNU GPL v2 or later, plus transitive 12 month grace period; http://allmydata.org/trac/tahoe/browser/COPYING',
       packages=["allmydata", "allmydata.test", "allmydata.util",
                 "allmydata.scripts",
                 "allmydata.Crypto", "allmydata.Crypto.Cipher",