Repayment and W2c

Hello,

 

In 2019, I repaid a sign-on bonus that I received in 2018.  The bonus in 2018 was $2,500.  My former employer had me repay $2,308.75.  This was the bonus minus social security and medicare withholding.  I received a W2c with boxes 3,4,5,6 updated.  IRS publication 525 has information on what to do for filing taxes for the year of repayment when repayment is over $3,000.  I am unclear on what to do when repayment was less.  Do I amend my 2018 filing minus the repayment amount?