Add black to CI

1 files changed, 9 insertions, 0 deletions

diff --git a/README.md b/README.md
index 903184b..15e9863 100644
--- a/README.md
+++ b/README.md
@@ -105,6 +105,15 @@ Some advice if you want to make a successful contribution:
  - Get early feedback, specially when working on a large contribution
  - Contributions always require a pull request and a review
 
+### Formatting
+
+This project uses [Black](https://github.com/psf/black) to format the Python
+code, and this is checked in CI.
+
+Before submitting any code to review, ensure you have installed Black 22.1.0 and run:
+
+    black .
+
 ## Authors
 
 This was mostly written by Juan J. Martinez during the development of