diff --git a/sources/test_calc.py b/sources/test_calc.py
index 130f9f7..e442f72 100644
--- a/sources/test_calc.py
+++ b/sources/test_calc.py
@@ -45,4 +45,5 @@ class TestCalc(unittest.TestCase):
         self.assertEqual(result, 'abc5.5')
 
 if __name__ == '__main__':
+    # trigger test
     unittest.main()