Pathfinder 1E – Penalties to the Power Attack and Stunning Assault Feats

The Power Attack feat allows you to choose to take a –1 penalty on all melee attack rolls and combat maneuver checks to gain a +2 bonus on all melee damage rolls.

The Stunning Assault feat, which lists Power Attack as a prerequisite, allows you to choose to take a –5 penalty on all melee attack rolls and combat maneuver checks to stun targets you hit with your melee attacks for 1 round.

Does this mean that using the two feats together requires you to take a cumulative –10 penalty to your melee attack rolls?