Made non-deductable traditional IRA contribution for 2020 after I filed, need an amendment?

Hello, 

 

I made an after-tax non-deducible traditional IRA contribution of $6000  for the tax year of 2020 after I filed my tax return. 

Since it is an after-tax contribution, doesn't have any affect on the taxes I paid. Do I have to file an amendment and if yes, how do I do that?