diff --git a/Arithmetic_kernel/include/CGAL/BOOST_MP_arithmetic_kernel.h b/Arithmetic_kernel/include/CGAL/BOOST_MP_arithmetic_kernel.h
index 1d565991bda..0887fe12f93 100644
--- a/Arithmetic_kernel/include/CGAL/BOOST_MP_arithmetic_kernel.h
+++ b/Arithmetic_kernel/include/CGAL/BOOST_MP_arithmetic_kernel.h
@@ -12,6 +12,8 @@
 // This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
 // WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
 //
+// $URL$
+// $Id$
 // SPDX-License-Identifier: LGPL-3.0+
 //
 // Author: Marc Glisse <marc.glisse@inria.fr>
diff --git a/Number_types/include/CGAL/boost_mp.h b/Number_types/include/CGAL/boost_mp.h
index 082a46cb149..f4811d202f3 100644
--- a/Number_types/include/CGAL/boost_mp.h
+++ b/Number_types/include/CGAL/boost_mp.h
@@ -12,6 +12,8 @@
 // This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
 // WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
 //
+// $URL$
+// $Id$
 // SPDX-License-Identifier: LGPL-3.0+
 //
 // Author(s)     : Marc Glisse