Given the number of times I've already seen this question asked I think you can assume that the answer in the original document is not completely clear to many people. You even have less to type by just saying "It's an add on."

Now having given you my grumpy old man attitude, I thank you for the effort you and your team are making. The future (which is short for me -cause I really am an old man)looks a lot brighter than I thought it would.