diff --git a/tox.ini b/tox.ini
index 2bd9dfa63..660274ea8 100644
--- a/tox.ini
+++ b/tox.ini
@@ -50,6 +50,10 @@ commands =
          python misc/coding_tools/check-debugging.py
          python misc/coding_tools/find-trailing-spaces.py -r src static misc setup.py
          python misc/coding_tools/check-miscaptures.py
+	 # If towncrier.check fails, you forgot to add a towncrier news
+	 # fragment explaining the change in this branch.  Create one at
+	 # `newsfragments/<ticket>.<change type>` with some text for the news
+	 # file.  See pyproject.toml for legal <change type> values.
          python -m towncrier.check
 
 [testenv:deprecations]