Now that the board is getting closer to release, people are looking to buy peripherals. Some M.2 cards are likely not compatible due to physical size. So in the manuals, like;
they should reference the size of the M.2 cards each slot can take. For example, it appears that the M key slot can only take 30, 60 and 80mm cards. But not 42mm or 110mm cards. So I suggest updating the various pages, 4, 5, and 6 to include the size of the cards each slot can support. Including WIDTH.
As has been mentioned in another thread, their are other uses someone might make of the M.2 M key slot, (video, USB or SATA), that might have different requirements. Like 30mm width. Or 42mm length. Having the allowed sizes documented can prevent mistakes in purchases.