Pennsylvania says, "You may need to submit other information such as copies of military orders (if on active duty outside Pennsylvania), Form(s) W-2 (if your employer withheld additional PA income tax), and tax returns you filed in other states (when requesting a PA Resident Credit)."
At a minimum, I would include any document that showed taxes withheld for PA.
**Say "Thanks" by clicking the thumb icon in a post
**Mark the post that answers your question by clicking on "Mark as Best Answer"