diff --git a/.travis.yml b/.travis.yml
index 0b56d4e7..975204a8 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -5,6 +5,9 @@ python:
     - 2.7
     - 3.3
     - 3.4
+#   - pypy
+#   - pypy3
+#   pypy and pypy3 blocked on a PyPy-compatible zope.security
 install:
     - pip install . --use-mirrors
 script:
diff --git a/setup.py b/setup.py
index 7a699633..a6ce8331 100644
--- a/setup.py
+++ b/setup.py
@@ -65,6 +65,8 @@ def read(*rnames):
         'Programming Language :: Python :: 3.3',
         'Programming Language :: Python :: 3.4',
         'Programming Language :: Python :: Implementation :: CPython',
+#       PyPy blocked on compatible release of zope.security
+#       'Programming Language :: Python :: Implementation :: PyPy',
         'Natural Language :: English',
         'Operating System :: OS Independent',
         'Topic :: Internet :: WWW/HTTP',
diff --git a/tox.ini b/tox.ini
index c0229e72..24392a94 100644
--- a/tox.ini
+++ b/tox.ini
@@ -1,5 +1,7 @@
 [tox]
-envlist = py26,py27,py33,py34
+envlist =
+#   pypy blocked on a PyPy-compatible zope.security  
+    py26,py27,py33,py34
 
 [testenv]
 commands =