I forgot to show received amount of pf in itr

I forgot to show received amount of Provident fund in ITR for assessment year 2015-16 what should i do now. P.F amount was credited in bank ac on dated 22-08-2014. I have already filed ITR for ass year 2015_16. And also refund process done and received . Now what should I do for PF amount received. Can i show it in Assessment year 2016-17. Please help.