2 files changed, 2 insertions, 1 deletions

diff --git a/dev-requirements.txt b/dev-requirements.txt
index 72463cc7..38b20fa4 100644
--- a/dev-requirements.txt
+++ b/dev-requirements.txt
@@ -2,6 +2,7 @@ coverage
 flake8
 invoke
 iso8601
+pep8-naming
 pretend
 pytest
 requests
diff --git a/tox.ini b/tox.ini
index 4248db38..27b652a0 100644
--- a/tox.ini
+++ b/tox.ini
@@ -41,4 +41,4 @@ commands = flake8 .
 
 [flake8]
 exclude = .tox,*.egg
-select = E,W,F
+select = E,W,F,N