diff --git a/tests/__init__.py b/tests/__init__.py
index d4c1bd5..4253ece 100644
--- a/tests/__init__.py
+++ b/tests/__init__.py
@@ -1,4 +1,7 @@
-# run tests: pytest -sv --cov-report term-missing --cov=workflow_calcium_imaging --sw -p no:warnings
+"""
+run all: python -m pytest -sv --cov-report term-missing --cov=workflow_calcium_imaging --sw -p no:warnings tests/
+run one: python -m pytest -sv --cov-report term-missing --cov=workflow_calcium_imaging --sw -p no:warnings --pdb tests/module_name.py -k function_name
+"""
 
 import os
 import pathlib