Comment 5 for bug 1809838

Personally I like the behavior described in #2, so I wouldn't object to keeping it that way.
However, I think we should add some player-visible documentation of it somewhere. Maybe add some comment to the documentation of the atlanteans mill? And/Or describe it in the first atlanteans campaign? With the current state it does look like a bug; different from other wares the economy "limit" for blackroot flour is more of a minimum threshold and seems to be ignored.
Also, we should add a comment to the init file of the mill that the "missing" condition is missing on purpose.