diff --git a/nlsr.h b/nlsr.h
index cb7a1c3..7ecb9d0 100644
--- a/nlsr.h
+++ b/nlsr.h
@@ -107,6 +107,8 @@
 	double cor_r;
 	double cor_theta;
 
+	int isStrictHierchicalKeyCheck;
+
 	int tunnel_type;