diff --git a/tests/calibrator/test_energy.py b/tests/calibrator/test_energy.py
index 9d885658..212a64e0 100644
--- a/tests/calibrator/test_energy.py
+++ b/tests/calibrator/test_energy.py
@@ -706,6 +706,7 @@ def test_add_offset_raises():
 
 
 def test_align_dld_sectors():
+    """test functionality and error handling of align_dld_sectors"""
     cfg_dict = {
         "dataframe": {
             "tof_column": "dldTimeSteps",