diff --git a/scripts/check_ecosystem.py b/scripts/check_ecosystem.py
index cbce193023319..1b173076c1d54 100755
--- a/scripts/check_ecosystem.py
+++ b/scripts/check_ecosystem.py
@@ -105,6 +105,9 @@ async def _get_commit(self: Self, checkout_dir: Path) -> str:
         return git_sha_stdout.decode().strip()
 
 
+# Repositories to check
+# We check most repositories with the default ruleset instead of all rules to avoid
+# noisy reports when new rules are added; see https://github.com/astral-sh/ruff/pull/3590
 REPOSITORIES: list[Repository] = [
     Repository("DisnakeDev", "disnake", "master"),
     Repository("PostHog", "HouseWatch", "main"),