diff --git a/calibration/OHP_Hg.calib b/calibration/OHP_Hg.calib
index c82407d..adbb5cb 100644
--- a/calibration/OHP_Hg.calib
+++ b/calibration/OHP_Hg.calib
@@ -1,4 +1,4 @@
-# Angstrom : calibration for ETA-6.0 and ETA-3.1 with retrieve_peak
+# Angstrom : calibration for ETA-6.0 and ETA-3.1 with retrieve_peak, in descending order of intensity
 4362.536282845347
 3653.64184183419
 4050.8128579815602