I just got the email notifying me of the quarterly addenda with the reminder: "Project teams are required to adhere to rating system corrections and LEED Interpretations based on LEED registration date. It is strongly recommended that project teams follow reference guide corrections."

How are people handling keeping (all of) their LEED reference guides up to date with these addenda? If a firm has a dozen copies of a dozen different ref guides, are people really marking up the changes by hand 4 times a year? Or are there complete online ref guides that are always up to date?

Related to that, if someone buys a ref guide tomorrow, will it be up to date addenda wise, or does USGBC expect them to know that they have to make 5 years worth of quarterly addenda corrections to this new book?