I actually can help here!!!! It's an increase. What you need to do is knit both into the front of the stitch and the back of the stitch before you slip it off the needle, thus making two stitches out of one.
Amy has a video I am sure. I will find it and post in a sec....
Yep, here's the link http://knittinghelp.com/knitting/videos/increase/increase-bar-english.mpg
ETA: If you're a conti knitter, please let us know, there's a video for that style as well.