diff --git a/index-lab.adoc b/index-lab.adoc
index e6507fd..e4a773b 100644
--- a/index-lab.adoc
+++ b/index-lab.adoc
@@ -33,8 +33,11 @@ TIP: How It Works, Apps, Swarm: The Five Principles of Swarm Intelligence
 
 === http://docs.swarmlab.io/SwarmLab-HowTos/labs/sec/ex-1_iptables.adoc.html[Scan and network statistics^] 
 
-TIP: This tutorial demonstrates some common Nmap port scanning scenarios and explains the output. 
+TIP: This tutorial demonstrates some common *nmap* port scanning scenarios and explains the output. 
 
+=== http://docs.swarmlab.io/SwarmLab-HowTos/labs/sec/ex-2_iptables.adoc.html[Network analysis^] 
+
+TIP: *tcpdump* is a common packet analyzer that runs under the command line. It allows the user to display TCP/IP and other packets being transmitted or received over a network to which the computer is attached. Distributed under the BSD license, tcpdump is free software.