diff --git a/PhysFit/B2DXFitters/src/MCBackground.cxx b/PhysFit/B2DXFitters/src/MCBackground.cxx
index e50b3db47b81792dd11544ebc07a94ce5e3521e3..c88cc0423a32ddd203adb4a1f39e7dcc7ce77420 100644
--- a/PhysFit/B2DXFitters/src/MCBackground.cxx
+++ b/PhysFit/B2DXFitters/src/MCBackground.cxx
@@ -1,3 +1,13 @@
+/*****************************************************************************\
+* (c) Copyright 2022 CERN for the benefit of the LHCb Collaboration           *
+*                                                                             *
+* This software is distributed under the terms of the GNU General Public      *
+* Licence version 3 (GPL Version 3), copied verbatim in the file "COPYING".   *
+*                                                                             *
+* In applying this licence, CERN does not waive the privileges and immunities *
+* granted to it by virtue of its status as an Intergovernmental Organization  *
+* or submit itself to any jurisdiction.                                       *
+\*****************************************************************************/
 /*****************************************************************************
  * Project: RooFit                                                           *
  *                                                                           *