diff --git a/Device/Data/CumulativeValue.h b/Device/Data/CumulativeValue.h
index 4900b0edac936efd45434978cd14b9112639fdb3..528a7e9693d099a8a93494e3bf1df44ec8a9a9f4 100644
--- a/Device/Data/CumulativeValue.h
+++ b/Device/Data/CumulativeValue.h
@@ -20,7 +20,7 @@
 #ifndef BORNAGAIN_DEVICE_DATA_CUMULATIVEVALUE_H
 #define BORNAGAIN_DEVICE_DATA_CUMULATIVEVALUE_H
 
-//! The cumulative value with average and rms on-the-flight calculations.
+//! The cumulative value, with on-the-flight calculation of average and root mean square.
 //! @ingroup tools
 
 class CumulativeValue {