Adding and/or deleting authors and/or changing the order of authors at revision stage may be justifiably warranted. A letter must accompany the revised manuscript to explain the reason for the change(s) and the contribution role(s) of the added and/or deleted author(s). Further documentation may be required to support your request.
按照投稿说明的话是可以增加的，但是一定要进行说明，

一般的期刊大修时是可以加作者的，但要强调他/她的重要贡献（非加他/她不可）