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	diff --git a/include/HEJ/LorentzVector.hh b/include/HEJ/LorentzVector.hh
	index 0b5ed8e..8190f92 100644
	--- a/include/HEJ/LorentzVector.hh
	+++ b/include/HEJ/LorentzVector.hh
	@@ -1,16 +1,25 @@
	+/** \file
	+ * \brief Auxiliary functions for Lorentz vectors
	+ *
	+ * \authors The HEJ collaboration (see AUTHORS for details)
	+ * \date 2019
	+ * \copyright GPLv2 or later
	+ */
	+#pragma once
	+
	#include "CLHEP/Vector/LorentzVector.h"

	namespace HEJ {
	inline
	auto dot(
	CLHEP::HepLorentzVector const & h1,
	CLHEP::HepLorentzVector const & h2
	) {
	return h1.dot(h2);
	}

	inline
	auto m2(CLHEP::HepLorentzVector const & h1) {
	return h1.m2();
	}
	}