diff --git a/labs/os2/index.adoc b/labs/os2/index.adoc
index ceb9ea3..d9fde84 100644
--- a/labs/os2/index.adoc
+++ b/labs/os2/index.adoc
@@ -42,7 +42,7 @@ http://docs.swarmlab.io/SwarmLab-HowTos/labs/os2/scan-and-network-statistics.ado
 
 http://docs.swarmlab.io/SwarmLab-HowTos/labs/os2/Iptables.adoc.html[iptables^]
 ****
-
+ 
 == SSH_Tunneling
 
 .SSH Tunneling