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Hole in the thermostat housing/ is it supposed to be there?

1992 40 MSHQ Yamaha. I’ve been doing a lot of maintenance on the boat since I bought it and learning as I go along thanks to you fine people for helping. Today I was replacing the thermostat and thought I’d share what I saw in the housing. I hope the hole is supposed to be there and my adventure isn’t coming to an end. I’m posting a picture of what I’m seeing. Again any advice is greatly appreciated.
It’s not letting me add the photo. After I click upload it disappears.
Its a small hole directly behind the thermostat.
 
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