diff --git a/tests/unit/test_detectors.py b/tests/unit/test_detectors.py
index 2127987..bc26f91 100644
--- a/tests/unit/test_detectors.py
+++ b/tests/unit/test_detectors.py
@@ -1,3 +1,6 @@
+#!/usr/bin/env python3
+"""Tests for endpoint detectors."""
+
 import os
 import tempfile
 from pathlib import Path