diff --git a/src/MINERvA/MINERvA_CC1pi0_XSec_1DQ2_antinu.cxx b/src/MINERvA/MINERvA_CC1pi0_XSec_1DQ2_antinu.cxx
index 7e40385..e4ce007 100644
--- a/src/MINERvA/MINERvA_CC1pi0_XSec_1DQ2_antinu.cxx
+++ b/src/MINERvA/MINERvA_CC1pi0_XSec_1DQ2_antinu.cxx
@@ -1,77 +1,85 @@
 // Copyright 2016 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 "MINERvA_SignalDef.h"
 
 #include "MINERvA_CC1pi0_XSec_1DQ2_antinu.h"
 
 // The constructor
 MINERvA_CC1pi0_XSec_1DQ2_antinu::MINERvA_CC1pi0_XSec_1DQ2_antinu(std::string inputfile, FitWeight *rw, std::string  type, std::string fakeDataFile){
 
   fName = "MINERvA_CC1pi0_XSec_1DQ2_antinu_2016";
   fPlotTitles = "; Q^{2} (GeV^{2}); d#sigma/dQ^{2} (cm^{2}/(GeV^{2})/nucleon)";
   EnuMin = 1.5;
   EnuMax = 10;
   fIsDiag = false;
   Measurement1D::SetupMeasurement(inputfile, type, rw, fakeDataFile);
 
   //this->SetDataValues(GeneralUtils::GetTopLevelDir()+"/data/MINERvA/CC1pi0/2016/cc1pi0_q2.txt");
   this->SetDataValues(GeneralUtils::GetTopLevelDir()+"/data/MINERvA/CC1pi0/2016/anu-cc1pi0-xsec-q2.csv");
 
   // Error is given as percentage of cross-section
   // Need to scale the bin error properly before we do correlation -> covariance conversion
   for (int i = 0; i < fDataHist->GetNbinsX()+1; i++) {
     fDataHist->SetBinError(i+1, fDataHist->GetBinContent(i+1)*fDataHist->GetBinError(i+1)/100.);
   }
 
   //this->SetCovarMatrixFromText(GeneralUtils::GetTopLevelDir()+"/data/MINERvA/CC1pi0/2016/cc1pi0_q2_corr.txt", fDataHist->GetNbinsX());
   this->SetCovarMatrixFromText(GeneralUtils::GetTopLevelDir()+"/data/MINERvA/CC1pi0/2016/anu-cc1pi0-correlation-q2.csv", fDataHist->GetNbinsX());
 
 
   this->SetupDefaultHist();
 
   this->fScaleFactor = this->fEventHist->Integral("width")*double(1E-38)/double(fNEvents)/TotalIntegratedFlux("width");
+
+  // Print warning for covariance
+  if (!fIsDiag){
+    ERR(FTL) << "The MINERvA CC1pi0 XSec 1DQ2 antinu covariance has problems inverting. We think it "
+	     << " is not semi-positive definite. As a result the likelihoods for this class are probably not to be trusted." << std::endl;
+    sleep(3);
+  }
+
 };
 
 void MINERvA_CC1pi0_XSec_1DQ2_antinu::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 hadMass = FitUtils::Wrec(Pnu, Pmu);
   double Q2      = -999;
 
   if (hadMass > 100 && hadMass < 1800)
     Q2 = FitUtils::Q2CC1pi0rec(Pnu, Pmu, Ppi0);
 
   fXVar = Q2;
 
   return;
 };
 
 //********************************************************************
 bool MINERvA_CC1pi0_XSec_1DQ2_antinu::isSignal(FitEvent *event) {
 //********************************************************************
   return SignalDef::isCC1pi(event, -14, 111, EnuMin, EnuMax);
 }