Correct. Line 21 of the Schedule A in 2017 was for unreimbursed employment expenses.
They want to see your Form 21006EZ. While you don't have to provide receipts at this time, it would be wise if you can provide details beyond the form such as dates.
For form details, follow this link: https://www.irs.gov/pub/irs-prior/f1040sa--2017.pdf
