diff --git a/README.md b/README.md
index 27c7ab0..b08a58b 100644
--- a/README.md
+++ b/README.md
@@ -21,18 +21,26 @@ pip install -r requirements.text
 Each day will include a pytest script that uses examples from the day.
 This allows for verifying the code works by running `pytest`. For example:
 
+
+Note: `--durations=0` shows the slowest tests (if taking longer then 0.005s
+
 ```
-|--% pytest -v puzzles/test_day01.py
-=========================================== test session starts ===========================================
-platform linux -- Python 3.9.7, pytest-6.2.5, py-1.11.0, pluggy-1.0.0 -- .venv/bin/python3
+|--% pytest -v --durations=0 puzzles/test_day04.py
+============================================= test session starts ==============================================
+platform linux -- Python 3.9.7, pytest-6.2.5, py-1.11.0, pluggy-1.0.0 -- venv-2021-advent-of-code/bin/python3
 cachedir: .pytest_cache
 rootdir: 2021-advent-of-code
 collected 4 items
 
-puzzles/test_day01.py::test_example1 PASSED                                                         [ 25%]
-puzzles/test_day01.py::test_example2 PASSED                                                         [ 50%]
-puzzles/test_day01.py::test_part1 PASSED                                                            [ 75%]
-puzzles/test_day01.py::test_part2 PASSED                                                            [100%]
+puzzles/test_day04.py::test_example1 PASSED                                                              [ 25%]
+puzzles/test_day04.py::test_example2 PASSED                                                              [ 50%]
+puzzles/test_day04.py::test_part1 PASSED                                                                 [ 75%]
+puzzles/test_day04.py::test_part2 PASSED                                                                 [100%]
+
+============================================== slowest durations ===============================================
+0.10s call     puzzles/test_day04.py::test_part2
+0.06s call     puzzles/test_day04.py::test_part1
 
-============================================ 4 passed in 0.06s ============================================
+(10 durations < 0.005s hidden.  Use -vv to show these durations.)
+============================================== 4 passed in 0.23s ===============================================
 ```