::The relevant policy is Wikipedia:SELFCITE#Citing_yourself. So, it's really a matter of judgement. I'd suggest dropping a note on the editor's page, reminding them of this policy, and suggesting that he consider proposing the additions on the talk page before adding going forward, to avoid perception of COI. If it's obviously relevant and has been left off, it should be fine, but if a reasonable editor thinks it's excessive, then there may be some promotion going on.