How do hydrochlorothiazide and lisinopril work together to lower blood pressure?

In Zestoretic, lisinopril inhibits ACE, reducing angiotensin II, vasopressor activity and aldosterone secretion, while hydrochlorothiazide increases renal sodium and chloride excretion; their complementary actions have an additive blood-pressure-lowering effect, although the mechanism of thiazides’ antihypertensive effect is unknown.