Husband passed interview this Monday in just 15 minutes and got his recommendation for approval. His application is based on EB/5 year GC. The only problem we just find out is that our marriage date on his N400 is wrong. During the interview, when the officer went through N400 asking about marriage date, my husband said xx/xx/1998. The officer said "but on your N400, it's xx/xx/1999". My husband answered, then it must be 1999 coz my wife filled the form and she must know the exact date. So the office just went on. But our marriage date was actually in 1998, not 1999. My husband is the kind of guy always forget birthday or anniversary. He just doesn't care. 
So what do you guys think about it? Do we need to do anything to correct this mistake? If we need to, how? If we don't do anything, what could be the worst case?
Thanks in advance
So what do you guys think about it? Do we need to do anything to correct this mistake? If we need to, how? If we don't do anything, what could be the worst case?
Thanks in advance