In my paystub I have an amount of ~$5000 as relocation bonus and relocation offset of $3000. What are those amounts and how should I use them in my tax return?

I was relocated in 2016 and received a grossed up relocation expenses. For tax return, I received a summary from the relocation company as follows

Additional reportable expenses: paid to employee: 0, paid to other: $3000, Tax category: taxable. And it shows in my end year paystub as relocation offset.

My question is: is it additional income I have to add or is it a tax offset?

Thank you for your help