diff --git a/CEP/Calibration/BBSKernel/src/MeasurementExprLOFAR.cc b/CEP/Calibration/BBSKernel/src/MeasurementExprLOFAR.cc
index d16a8f908948913871cdfce08272621c7e207026..503a01924da334a308fc50f33e0b5d33a11d0b9e 100644
--- a/CEP/Calibration/BBSKernel/src/MeasurementExprLOFAR.cc
+++ b/CEP/Calibration/BBSKernel/src/MeasurementExprLOFAR.cc
@@ -860,7 +860,9 @@ void MeasurementExprLOFAR::setCorrelations(bool circular)
     if(circular)
     {
         LOG_DEBUG_STR("Visibilities will be simulated using circular-RL"
-            " correlations.");
+            " correlations. Instrument tables are interpreted as linear"
+            " so when applying them the visibilities will be converted to"
+            " linear and back.");
         itsCorrelations.append(Correlation::RR);
         itsCorrelations.append(Correlation::RL);
         itsCorrelations.append(Correlation::LR);