This is the depreciation adjustment that is made if you are impacted by the Alternative Minimum Tax. The adjustment reflects the amount that would be changed in calculating the AMT for your particular situation. The amount of the adjustment changes based on your other income and deduction amounts. So it isn't effected by any new laws this year. Your income and deductions are just different this year than last, apparently.
The calculation for this is fairly complicated. If you have form 6251 in your return you can look at that form and the associated worksheets to see the calculations that are being done. The actual AMT effects very few taxpayers as a percentage so it probably has no effect on you but if it does the 6251 will show the calculations as to why.
@9month9wine
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