How to do chamfered edge with lark's tongue

[Carlos Arteta]

I am newbie using routers. I want to use a 45 degree chamfer bit to create chamfered edges on a 6x6 post. I would like to achieve a lark's tongue finish.

http://en.wikipedia.org/wiki/File:Larks_tongue.JPG

What is the trick? Do I need to lift the router when reaching the end of the chamfer to get the tongue? Do it by hand? I couldn't find any reference online. I will be using a handheld router.

Thanks