A rotor disk assembly includes a rotor disk. The rotor disk includes a first rotor lug, a second rotor lug circumferentially spaced from the first rotor lug and defining a slot therebetween. The slot is located on a radially outward portion of the rotor disk and the slot has an undercut engagement portion defined by the first rotor lug and the second rotor lug. The undercut engagement portion is positioned circumferentially on the rotor disk to engage a rotor clip.