videobridge-installation.md

@@ -86,6 +86,8 @@ JVB_SECRET=secret
 JVB_OPTS="--apis=rest,xmpp --subdomain=jvb-HOSTINGPARTNER-0"
 ```
 
+### do some kernel performance tweaking
+
 In `/etc/systemd/system.conf` add     
 ```
 DefaultLimitNOFILE=65000