diff --git a/EvtGenExternal/EvtPythiaEngine.hh b/EvtGenExternal/EvtPythiaEngine.hh
index 47640ba..d0e0dd8 100644
--- a/EvtGenExternal/EvtPythiaEngine.hh
+++ b/EvtGenExternal/EvtPythiaEngine.hh
@@ -1,98 +1,114 @@
/***********************************************************************
* Copyright 1998-2020 CERN for the benefit of the EvtGen authors *
* *
* This file is part of EvtGen. *
* *
* EvtGen 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. *
* *
* EvtGen 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 EvtGen. If not, see . *
***********************************************************************/
#ifdef EVTGEN_PYTHIA
#ifndef EVTPYTHIAENGINE_HH
#define EVTPYTHIAENGINE_HH
#include "EvtGenBase/EvtDecayAmp.hh"
#include "EvtGenBase/EvtDecayBase.hh"
#include "EvtGenBase/EvtId.hh"
#include "EvtGenBase/EvtParticle.hh"
#include "EvtGenBase/EvtVector4R.hh"
#include "EvtGenModels/EvtAbsExternalGen.hh"
#include "EvtGenExternal/EvtPythiaRandom.hh"
#include "Pythia8/ParticleData.h"
#include "Pythia8/Pythia.h"
#include