Joe,
I know Mark personally, as well, I work with him and he is a very nice person. Sorry if you took it wrong , it was a little more information than you asked for.
If you have any problems with the unit down the road, feel free to call in and ask for me or email me a phone number to contact you at. I am "normally" quick to get a fix and off to my next project. Though I do ramble with a few customers sometimes. Get a guy started on welding, cars, bikes, guns, etc..
I think you are right and we should add that to the manual as I've had that question a few times in the past and not everyone makes it to the forum here.
Have a good weekend.