That's because Skelly refers to a CA supreme court case. In Skelly v. State Personnel Bd. (1975) 15 Cal.3d 194, the California Supreme Court held that in order to satisfy due process, an agency considering disciplinary action against a public employee must accord the employee certain "preremoval safeguards," including "notice of the proposed action, the reasons therefor, a copy of the charges and materials upon which the action is based, and the right to respond, either orally or in writing, to the authority initially imposing discipline." (Id. at p. 215.) The Supreme Court's directive gave rise to an administrative procedure known as a Skelly hearing, in which an employee has the opportunity to respond to the charges upon which the proposed discipline is based.
If you are a civil service/public employee, the provisions regarding disciplinary proceedings are in Government Code section 19570 et. seq.