What happens to the charge of polyatomic ion phosphate when an H is added to the formula?

In even moderately strong acid conditions in aqueous solution, a polyatomic phosphate ion with a charge of -3 will add an hydrogen ion with a charge of +1 to form a polyatomic acid phosphate anion with a charge of -2.

In equation form, PO4-3 + H+1 -> HPO4-2.