diff --git a/Water quality calibration/readme.md b/Water quality calibration/readme.md
index a59f90f5473e869616b1eb0f6c789e9eb3f4d53a..60ce2e0c508839f9343bd64a6e22f1b6380f96ef 100644
--- a/Water quality calibration/readme.md	
+++ b/Water quality calibration/readme.md	
@@ -28,6 +28,9 @@ sensor_positions.xlsx:
 - It also contains a the position and name of a discharge sensor, which is used to adjust the time shift later
 - Note that chainages are only approximate. You should use a chainage that is available in the result files. Check the hd results files wit hthe given script beforehand
 
+sensor_data.xlsx:
+- this table contains the sensor name of the quality and flow data and connects them to reaches in the model
+
 event_dict.xlsx:
 - this excel file contains information if multiple events are simulated together
 - if you are doing this: Simplay write under event the single events and under result file the result file name in which the event is included