How to fix my previous year basis for traditional IRA?

My 2016 traditional IRA basis is wrong.

I entered the correct value, and turbo tax say "the IRA basis we transferred from 2016 is different from the basis entered. Include a brief explanation of why your IRA basis changed with your return"

Is this enough? is the explanation also sent to IRS?

Or do I need to fix "amend" last year return to correct my trad IRA basis?