diff --git a/RTCP/Cobalt/GPUProc/src/rtcp.cc b/RTCP/Cobalt/GPUProc/src/rtcp.cc
index c98dd01c74cb812b1c54e0d8194463cfa98cb624..ce13179554b7a6bb91b23db9b2f6b37555ba9408 100644
--- a/RTCP/Cobalt/GPUProc/src/rtcp.cc
+++ b/RTCP/Cobalt/GPUProc/src/rtcp.cc
@@ -463,6 +463,7 @@ int main(int argc, char **argv)
     feedbackLTA.adoptCollection(storageProcesses->feedbackLTA());
 
     // augment LTA feedback with global information
+    feedbackLTA.add("_isCobalt", "T"); // for MoM, to discriminate between Cobalt and BG/P observations
     feedbackLTA.add("LOFAR.ObsSW.Observation.DataProducts.nrOfOutput_Beamformed_", str(format("%u") % ps.nrStreams(BEAM_FORMED_DATA)));
     feedbackLTA.add("LOFAR.ObsSW.Observation.DataProducts.nrOfOutput_Correlated_", str(format("%u") % ps.nrStreams(CORRELATED_DATA)));