Question regarding timing cover

Does anyone have any good blown up pictures of the front of a timing cover? The side that is behind the back of the water pump? I had a antifreeze leak that appeared to be coming from the bottom of the water pump, so I am in the process of replacing the water pump. After scraping off the old gasket material from the timing cover, I noticed a good size notch towards the bottom of the timing cover where the water pump gasket goes over. I believe that is where the coolant might have been coming from. I am just wondering if anyone else has ever seen this notch on their timing cover and where it could have came from? I am wondering if I should fill it in with JB weld before I put the water pump on.

Thanks!

Thanks for the reply, good to hear that someone else has seen one on theirs. I couldn't figure out how in the heck a notch like that just would have appeared on there. I wish I knew what it was for though.