I forgot to add my foreign bank account on my tax return

Hello,

 

I have a foreign bank account with less than $10K (US dollars) and forgot to mention that I have this account on my taxes, I already filled my tax return and got accepted by the IRS and received my refund. 

 

Do you recommend filling an amendment for this? Or should I just mention I have a foreign bank account with less than $10K on next year taxes?  

 

Thank you in advance!