Add comment about new data type.

Author: Mattia Faggin

PWGHF/TableProducer/candidateCreatorSigmac0plusplus.cxx

@@ -417,7 +417,7 @@ struct HfCandidateSigmac0plusplusMc {
 
   using BCsInfo = soa::Join<aod::BCs, aod::Timestamps, aod::BcSels>;
   using LambdacMc = soa::Join<aod::HfCand3Prong, aod::HfSelLc, aod::HfCand3ProngMcRec>;
-  using McParticlesLcGenMatch = soa::Join<aod::McParticles, aod::HfCand3ProngMcGen>;
+  using McParticlesLcGenMatch = soa::Join<aod::McParticles, aod::HfCand3ProngMcGen>; // including response of particle matching to MC from candidate-creator-3-prong
   using McCollisionsNoCents = soa::Join<aod::Collisions, aod::EvSels, aod::McCollisionLabels>;
 
   PresliceUnsorted<McCollisionsNoCents> colPerMcCollision = aod::mccollisionlabel::mcCollisionId;