diff --git a/.travis.yml b/.travis.yml
index fb11944..9608012 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -15,8 +15,10 @@ matrix:
     env: TOXENV=py37
   - python: pypy
     env: TOXENV=pypy
-  - python: pypy3
-    env: TOXENV=pypy3
+# Travis CI hasn't updated to PyPy3 2.5 yet, so still has the exception
+# chaining compatibility bug that breaks the contextlib2 tests
+#  - python: pypy3
+#    env: TOXENV=pypy3
 install: pip install tox coveralls && tox --notest
 script: tox
 after_success: coveralls
diff --git a/README.rst b/README.rst
index fd217f6..a90264c 100644
--- a/README.rst
+++ b/README.rst
@@ -46,4 +46,11 @@ Versions currently tested in both tox and Travis CI are:
 * CPython 3.6
 * CPython 3.7 (CPython development branch)
 * PyPy
+
+Versions currently tested only in tox are:
+
 * PyPy3
+
+This is due to an exception chaining compatibility bug that was fixed in
+the PyPy3 5.5 alpha release, while the version on Travis CI (as of April 2017)
+is still the older PyPy3 2.4.0 release.