diff --git a/apps/stupid-interest-sink.cc b/apps/stupid-interest-sink.cc
index febd621..c9b166e 100644
--- a/apps/stupid-interest-sink.cc
+++ b/apps/stupid-interest-sink.cc
@@ -1,3 +1,4 @@
+/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
 //
 //  stupid-interest-sink.cpp
 //  Abstraction