diff --git a/examples/tutorial/first.cc b/examples/tutorial/first.cc
index 73cdf1fe2..ca91a83c7 100644
--- a/examples/tutorial/first.cc
+++ b/examples/tutorial/first.cc
@@ -20,6 +20,13 @@
 #include "ns3/point-to-point-module.h"
 #include "ns3/applications-module.h"
 
+// Default Network Topology
+//
+//       10.1.1.0
+// n0 -------------- n1
+//    point-to-point
+//
+ 
 using namespace ns3;
 
 NS_LOG_COMPONENT_DEFINE ("FirstScriptExample");