diff --git a/src/graphmatch_rcpp.cpp b/src/graphmatch_rcpp.cpp
index f8421f6..d299003 100644
--- a/src/graphmatch_rcpp.cpp
+++ b/src/graphmatch_rcpp.cpp
@@ -1,3 +1,4 @@
+// # Copyright (C) Sancar Adali 2015-2017
 
 #include <Rcpp.h>
 #include <RcppGSL.h>