My W2 only shows my employer's contributions to my HSA in box 12. Should it also include my payroll deductions? If so, what should I do?

My employer contributed $1500 to my HSA and I had payroll deductions to go towards my HSA, lets say $2000. However, on my W2 in box 12 it only says "W 1500". Should it also include my $2000? If so, do I need to get a revised W-2? Or if not, where should my $2000 go on my tax forms?