diff --git a/lib/xos-genx/tox.ini b/lib/xos-genx/tox.ini
new file mode 100644
index 0000000..56c85a5
--- /dev/null
+++ b/lib/xos-genx/tox.ini
@@ -0,0 +1,21 @@
+; Copyright 2017-present Open Networking Foundation
+;
+; Licensed under the Apache License, Version 2.0 (the "License");
+; you may not use this file except in compliance with the License.
+; You may obtain a copy of the License at
+;
+; http://www.apache.org/licenses/LICENSE-2.0
+;
+; Unless required by applicable law or agreed to in writing, software
+; distributed under the License is distributed on an "AS IS" BASIS,
+; WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+; See the License for the specific language governing permissions and
+; limitations under the License.
+
+; using tox.ini to store config information for other tools
+
+[flake8]
+; F821, ignoring undefined names would be valuable, but our testing dynamically loads them
+; W503, allow breaks before binary operators (see: https://github.com/PyCQA/pycodestyle/issues/498)
+ignore = F821, W503
+max-line-length = 200