diff --git a/dune/istl/cholmod.hh b/dune/istl/cholmod.hh
index be3194fba746f7c34aa90bab6bd74508c806f480..420038fc4a5ea7fa35efa4fe7f1a27c794dbaea8 100644
--- a/dune/istl/cholmod.hh
+++ b/dune/istl/cholmod.hh
@@ -1,8 +1,10 @@
 // SPDX-FileCopyrightText: Copyright © DUNE Project contributors, see file LICENSE.md in module root
 // SPDX-License-Identifier: LicenseRef-GPL-2.0-only-with-DUNE-exception
+// -*- tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*-
+// vi: set et ts=4 sw=2 sts=2:
 #pragma once
 
-#if HAVE_SUITESPARSE_CHOLMOD
+#if HAVE_SUITESPARSE_CHOLMOD || defined DOXYGEN
 
 #include <dune/common/fmatrix.hh>
 #include <dune/common/fvector.hh>