diff --git a/pytroll_collectors/tests/test_scisys.py b/pytroll_collectors/tests/test_scisys.py
index b1b0dae..3635bfe 100644
--- a/pytroll_collectors/tests/test_scisys.py
+++ b/pytroll_collectors/tests/test_scisys.py
@@ -294,7 +294,7 @@ def test_create_message_topic_from_message_and_config_pattern(sensor, sensor_nam
 
 
 def test_no_sensor_list_in_sending_topic():
-    """Test that list of sensors are replaced with string multiple_sensors/."""
+    """Test that a list of sensors is replaced with string multiple_sensors/."""
     to_send = {'start_time': datetime.datetime(2024, 4, 23, 5, 34, 4),
                'end_time': datetime.datetime(2024, 4, 23, 5, 39, 34),
                'orbit_number': 78360,