diff --git a/tests/unit/test_models.py b/tests/unit/test_models.py
index 202044f..6bb64e9 100644
--- a/tests/unit/test_models.py
+++ b/tests/unit/test_models.py
@@ -1,3 +1,6 @@
+#!/usr/bin/env python3
+"""Tests for docgen models."""
+
 from pathlib import Path
 
 from docgen.models import (