diff --git a/L1Trigger/TrackFindingTracklet/plugins/ProducerDR.cc b/L1Trigger/TrackFindingTracklet/plugins/ProducerDR.cc
index 76aa6de02b0de..967e41456904c 100644
--- a/L1Trigger/TrackFindingTracklet/plugins/ProducerDR.cc
+++ b/L1Trigger/TrackFindingTracklet/plugins/ProducerDR.cc
@@ -31,7 +31,8 @@ using namespace tt;
 namespace trklet {
 
   /*! \class  trklet::ProducerDR
-   *  \brief  Emulates removal of duplicated TTTracks f/w
+   *  \brief  Emulates removal of duplicated TTTracks f/w.
+   *          Track order determined by TrackMultiplexer affects performance
    *  \author Thomas Schuh
    *  \date   2023, Feb
    */
diff --git a/L1Trigger/TrackFindingTracklet/plugins/ProducerTM.cc b/L1Trigger/TrackFindingTracklet/plugins/ProducerTM.cc
index 036086fcedaa2..1697c00561bee 100644
--- a/L1Trigger/TrackFindingTracklet/plugins/ProducerTM.cc
+++ b/L1Trigger/TrackFindingTracklet/plugins/ProducerTM.cc
@@ -34,6 +34,7 @@ namespace trklet {
 
   /*! \class  trklet::ProducerTM
    *  \brief  Transforms format of TBout into that expected by DR input and muxes all channels to 1.
+              Since DR keeps first tracks the mux ordering is important.
    *  \author Thomas Schuh
    *  \date   2023, Jan
    */
diff --git a/L1Trigger/TrackFindingTracklet/src/TrackMultiplexer.cc b/L1Trigger/TrackFindingTracklet/src/TrackMultiplexer.cc
index a913ac5e9b5fb..f9dba5a5b02d3 100644
--- a/L1Trigger/TrackFindingTracklet/src/TrackMultiplexer.cc
+++ b/L1Trigger/TrackFindingTracklet/src/TrackMultiplexer.cc
@@ -395,6 +395,7 @@ namespace trklet {
     deque<Track*> accepted;
     vector<deque<Track*>> stacks(channelAssignment_->numChannelsTrack());
     vector<deque<Track*>> streams(channelAssignment_->numChannelsTrack());
+    // mux order affects DR
     for (int channel = 0; channel < channelAssignment_->numChannelsTrack(); channel++)
       for (Track* track : input_[channel])
         streams[channel].push_back((track && track->valid_) ? track : nullptr);