diff --git a/tox.ini b/tox.ini
index 73c448c..28a82db 100644
--- a/tox.ini
+++ b/tox.ini
@@ -1,6 +1,6 @@
 [tox]
 toxworkdir = {env:TMPDIR:/tmp}/tox-{env:USER}/passerelle-grandlyon-cartads-cs/{env:BRANCH_NAME:}
-envlist = py3-{django111,django22}
+envlist = py3-django111-black,py3-django22
 
 [testenv]
 usedevelop = True
@@ -15,5 +15,7 @@ deps =
   psycopg2-binary
   pytest
   pytest-django
+  black: pre-commit
 commands =
   py.test {posargs: --junitxml=junit-{envname}.xml tests/}
+  black: pre-commit run black --all-files --show-diff-on-failure