diff --git a/imap_processing/tests/ultra/unit/test_ultra_l1b_extended.py b/imap_processing/tests/ultra/unit/test_ultra_l1b_extended.py
index 33f634a31..b48c62afe 100644
--- a/imap_processing/tests/ultra/unit/test_ultra_l1b_extended.py
+++ b/imap_processing/tests/ultra/unit/test_ultra_l1b_extended.py
@@ -1,3 +1,5 @@
+"""Tests Extended Raw Events for ULTRA L1b."""
+
 import pandas as pd
 import pytest