How Do I make curved lines with the pen tool in after effects CS6

Hello, so I have been following this video http://www.youtube.com/watch?v=vKzB-CFT0MI on how to make 2d intros in after effects and at the 2:20 mark he shows how he uses the pen tool to make curved lines around the elipse. I tried to do the samething myself, and couldent make the curved lines. I looked it up online and there were tutorials on how to make curved lines but they did not work the same way, and I could not make curves like he did.So if any of you know how to do curved lines like in the video, your help will be appreciated.

Thanks !