diff --git a/src/MiniBooNE/MiniBooNE_CC1pi0_XSec_1DEnu_nu.cxx b/src/MiniBooNE/MiniBooNE_CC1pi0_XSec_1DEnu_nu.cxx
index bcadf69..3987bd4 100644
--- a/src/MiniBooNE/MiniBooNE_CC1pi0_XSec_1DEnu_nu.cxx
+++ b/src/MiniBooNE/MiniBooNE_CC1pi0_XSec_1DEnu_nu.cxx
@@ -1,97 +1,100 @@
 // Copyright 2016-2021 L. Pickering, P Stowell, R. Terri, C. Wilkinson, C. Wret
 
 /*******************************************************************************
  *    This file is part of NUISANCE.
  *
  *    NUISANCE is free software: you can redistribute it and/or modify
  *    it under the terms of the GNU General Public License as published by
  *    the Free Software Foundation, either version 3 of the License, or
  *    (at your option) any later version.
  *
  *    NUISANCE is distributed in the hope that it will be useful,
  *    but WITHOUT ANY WARRANTY; without even the implied warranty of
  *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  *    GNU General Public License for more details.
  *
  *    You should have received a copy of the GNU General Public License
  *    along with NUISANCE.  If not, see <http://www.gnu.org/licenses/>.
  *******************************************************************************/
 
 #include "MiniBooNE_CC1pi0_XSec_1DEnu_nu.h"
 
 //********************************************************************
 MiniBooNE_CC1pi0_XSec_1DEnu_nu::MiniBooNE_CC1pi0_XSec_1DEnu_nu(
     nuiskey samplekey) {
   //********************************************************************
 
   // Sample overview ---------------------------------------------------
   std::string descrip = "MiniBooNE_CC1pi0_XSec_1DEnu_nu sample. \n"
                         "Target: CH2 \n"
                         "Flux: MiniBooNE Forward Horn Current \n"
                         "Signal: Any event with 1 muon, 1 neutral pion, any "
                         "nucleons, and no other FS particles \n";
 
   // Setup common settings
   fSettings = LoadSampleSettings(samplekey);
   fSettings.SetDescription(descrip);
   fSettings.SetXTitle("E_{#nu} (GeV)");
   fSettings.SetYTitle("#sigma(E_{#nu}) (cm^{2}/CH_{2})");
   fSettings.SetAllowedTypes("FIX,FREE,SHAPE/FULL,DIAG/NORM/MASK", "FIX/FULL");
   fSettings.SetEnuRange(0.5, 2.0);
   fSettings.DefineAllowedTargets("C,H");
 
+  // Because this dataset seems to have a broken covariance, add a strong warning
+  NUIS_ERR(WRN, "Sample " << fSettings.GetName() << " is known to give nonsensical chi-square values!");
+
   // CCQELike plot information
   fSettings.SetTitle("MiniBooNE_CC1pi0_XSec_1DEnu_nu");
   fSettings.SetDataInput(FitPar::GetDataBase() +
                          "MiniBooNE/CC1pi0/totalxsec_edit.txt");
   fSettings.SetCovarInput(FitPar::GetDataBase() +
                           "MiniBooNE/CC1pi0/totalxsec_covar.txt");
   fSettings.DefineAllowedSpecies("numu");
 
   FinaliseSampleSettings();
 
   // Scaling Setup ---------------------------------------------------
   // ScaleFactor automatically setup for DiffXSec/cm2/Nucleon
   fScaleFactor = GetEventHistogram()->Integral("width") * double(1E-38) /
                  double(fNEvents) * (14.08);
 
   // Plot Setup -------------------------------------------------------
   SetDataFromTextFile(fSettings.GetDataInput());
   SetCorrelationFromTextFile(fSettings.GetCovarInput());
   SetShapeCovar();
 
   // Final setup  ---------------------------------------------------
   FinaliseMeasurement();
 };
 
 void MiniBooNE_CC1pi0_XSec_1DEnu_nu::FillEventVariables(FitEvent *event) {
 
   if (event->NumFSParticle(111) == 0 || event->NumFSParticle(13) == 0)
     return;
 
   TLorentzVector Pnu = event->GetNeutrinoIn()->fP;
   TLorentzVector Ppi0 = event->GetHMFSParticle(111)->fP;
   TLorentzVector Pmu = event->GetHMFSParticle(13)->fP;
 
   double Enu = FitUtils::EnuCC1pi0rec(Pnu, Pmu, Ppi0);
 
   fXVar = Enu;
 
   return;
 };
 
 // **************************************************
 // MiniBooNE CC1pi0 signal definition
 //
 // The signal definition is:
 //                          Exactly one negative muon
 //                          Exactly one pi0
 //                          No additional mesons
 //                          Any number of nucleons
 //
 // Does a few clever cuts on the likelihood to reduce CCQE contamination by
 // looking at "fuzziness" of the ring; CCQE events are sharp, CC1pi0 are fuzzy
 // (because of the pi0->2 gamma collinearity)
 bool MiniBooNE_CC1pi0_XSec_1DEnu_nu::isSignal(FitEvent *event) {
   return SignalDef::isCC1pi(event, 14, 111, EnuMin, EnuMax);
 }