Strange tiny hole in my egg?

I noticed this tiny hole in one of my eggs. It's not all the way through...as far as I can tell the membrane seems to be intact still. I've never seen this before and it looks too perfect to be accidental. What could have caused this??

I noticed this tiny hole in one of my eggs. It's not all the way through...as far as I can tell the membrane seems to be intact still. I've never seen this before and it looks too perfect to be accidental. What could have caused this??