1 files changed, 4 insertions, 1 deletions
diff --git a/tox.ini b/tox.ini
index 2478967..d8edd3c 100644
--- a/tox.ini
+++ b/tox.ini
@@ -30,4 +30,7 @@ deps=
       pydocstyle<4.0.0
       # used by flake8-rst-docstrings
       pygments
-commands = flake8 ./mako/ ./test/ setup.py --exclude test/templates,test/foo  {posargs}
+      black==21.9b0
+commands =
+    flake8 ./mako/ ./test/ setup.py --exclude test/templates,test/foo  {posargs}
+    black --check .