Does the Mark of Tzeentch ward save stack with a parry save? The way its worded makes me think that it does.

IE- a warrior of chaos with a HW and shield has a 3+ armour save, and a 5+ Parry save, or a 6+ ward against non close combat attacks.

Can anyone tell me if im right, or better yet point me to a GW reference that clears this up?