How do I detect Quality Level changes?

So I know as much as this, as briefly documented by the wiki:

print(UserSettings():FindService('UserGameSettings').SavedQualityLevel)

But how do I detect changes of it?

Thanks for asking, I've wondered this too before, but just tampering with it for 5 seconds, led me to the conclusion and simple answer.

UserSettings():FindService("UserGameSettings").Changed:connect(function(one) print(one)  
	if one == "SavedQualityLevel" then 
		print("Changed!")
		print(UserSettings():FindService('UserGameSettings').SavedQualityLevel)
	end

	-- you can also use this for other things, and your welcome btw.
end)

you are free to use this for other purposes too, example:

UserSettings():FindService("UserGameSettings").Changed:connect(function(one) print(one)  
	if one == "MasterVolume" then 
		print("Changed!")
		print(UserSettings():FindService('UserGameSettings').MasterVolume)
	end

	-- you can also use this for other things, and your welcome btw.
end)

Youd probably have to use a while wait() do loop, as I dont believe the property .Changed is available for that service.