"Note that if you select the "Custom" option and select multiple friends groups, all of your friends in the selected groups will be able to see the entry."
However, I think that should be moved (or at the very least, repeated) up to the CUSTOM section of that same FAQ. I would expect to find it where there's an explanation of what 'custom' actually *is*, not necessarily where it's talking about how to choose 'custom'.
I think it would also be good to add it to FAQ 102 - What are custom friends groups..., perhaps in the SECURITY NOTES section at the end.
I'll stop spamming this comm now. ;D