diff --git a/README.md b/README.md
index 8656660..a051095 100644
--- a/README.md
+++ b/README.md
@@ -79,9 +79,9 @@ done < /project/hosts
 
 See 
 
-- [sec1](http://docs.swarmlab.io/SwarmLab-HowTos/labs/sec/ex-1_iptables.adoc.html){:target="_blank"}
-- http://docs.swarmlab.io/SwarmLab-HowTos/labs/sec/ex-2_iptables.adoc.html
-- http://docs.swarmlab.io/SwarmLab-HowTos/labs/sec/ex-3_iptables.adoc.html
-- http://docs.swarmlab.io/SwarmLab-HowTos/labs/sec/ex-3a_iptables-flow-chart.adoc.html
+- [sec1](http://docs.swarmlab.io/SwarmLab-HowTos/labs/sec/ex-1_iptables.adoc.html){target="_blank"}
+- [sec2](http://docs.swarmlab.io/SwarmLab-HowTos/labs/sec/ex-2_iptables.adoc.html){target="_blank"} 
+- [sec3](http://docs.swarmlab.io/SwarmLab-HowTos/labs/sec/ex-3_iptables.adoc.html){target="_blank"} 
+- [sec4](http://docs.swarmlab.io/SwarmLab-HowTos/labs/sec/ex-3a_iptables-flow-chart.adoc.html){target="_blank"} 
 ---