diff --git a/tox.ini b/tox.ini
index f83b60c70c6a5cffff1d5ea090b81b7d9ddad371..36ffc63c895524d1ca0c7e27d033e4fa734cbed9 100644
--- a/tox.ini
+++ b/tox.ini
@@ -36,6 +36,11 @@ commands = poetry build
 [testenv:docs]
 commands = poetry run make -C docs/ html {posargs}
 
+[testenv:reformat]
+commands =
+    poetry run black biscuit/core/
+    poetry run isort -rc biscuit/core/
+
 [flake8]
 max_line_length = 100
 exclude = migrations,tests