diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index fa179388c2766b09ea11e701ed1572967eeda061..af91fa7d11c489ed3e42ba0f8c73fdd411e3f284 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -81,6 +81,7 @@ style:
     - black --check --diff .
     - pydocstyle mpsd-software-environment.py
     - pydocstyle tests.py
+    # we could also use `ruff --select D` for pycodestyle. But the behaviour is not exactly the same.
 
 
 test-bullseye: