i 864a no tax return for my spouse record

[dpark189 0]

We are filing form i-864a we are using my wife's income, she is the intending immigrant. However, she started working from Feb of this year and her total income from the previous tax year was less than the amount that would have required her to file a tax return, so she didn't file. In part 4 question 1a it says that we have to attach a photo copy of her tax return, but since she doesn't have a tax return to attach. What should we do? 

[dpark189 0]

Thank you for your quick answer!