diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index 4387cb6d82c..e3debf6477f 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -199,13 +199,13 @@ Follow these steps to start contributing:
    are useful to avoid duplicated work, and to differentiate it from PRs ready
    to be merged;
 4. Make sure existing tests pass;
+
 5. Add high-coverage tests. No quality test, no merge. 
-If you are adding a new model, make sure that you use `ModelTester.all_model_classes`, which triggers the common tests.
-If you are adding new `@slow` tests, make sure they pass using `RUN_SLOW=1 python -m pytest tests/test_my_new_model.py`. 
+ - If you are adding a new model, make sure that you use `ModelTester.all_model_classes = (MyModel, MyModelWithLMHead,...)`, which triggers the common tests.
+ - If you are adding new `@slow` tests, make sure they pass using `RUN_SLOW=1 python -m pytest tests/test_my_new_model.py`. 
 CircleCI does not run them. 
 6. All public methods must have informative docstrings;
 
-
 ### Tests
 
 You can run 🤗 Transformers tests with `unittest` or `pytest`.