diff --git a/helper/ndnabstraction-helper.cc b/helper/ndnabstraction-helper.cc
index e02c5eb..d8d5db3 100644
--- a/helper/ndnabstraction-helper.cc
+++ b/helper/ndnabstraction-helper.cc
@@ -1,3 +1,4 @@
+/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; c-set-offset 'innamespace 0; -*- */
 /*
  *  ndnabstraction-helper.c
  *  XcodeProject