What is 'Adding Missing Items'?

If you click on your points breakdown page, you'll see an item called 'adding missing items' that gives you 10 points each.

I clicked on mine, and it's zero, meaning that i haven't posted anything, even though i posted too many songs from Amazon that weren't on Listal, i also added documentaries from IMDb, so weren't these missing items? or is it something else?

You will get some points as soon as someone will rate the concerned items. It makes sense actually, this way you are sure that someone won't add some random sh*t that nobody cares about just for the extra points.