diff --git a/doc/contributing.rst b/doc/contributing.rst
index b032fbd..7367f4c 100644
--- a/doc/contributing.rst
+++ b/doc/contributing.rst
@@ -4,9 +4,13 @@ Contributing
If you're submitting patches to pagure, please observe the following:
- Check that your python code is `PEP8-compliant
- `_. There is a `pep8 tool
- `_ that can automatically check
- your source.
+ `_. There is a `flake8 tool
+ `_ that automatically check the sources as
+ part of the tests.
+
+- We run the source code through `black `_
+ as part of the tests, so you may have to do some adjustments or run it
+ yourself (which is simple: ``black /path/to/pagure``).
- Check that your code doesn't break the test suite. The test suite can be
run using the ``runtests.sh`` shell script at the top of the sources.