superscribe

Etymology
From.

Verb

 * 1)  to write on the exterior of, the surface of, or above.
 * He superscribed each character with its Latin-alphabet equivalent.
 * 1)  to write (something) on the exterior of an object, such as a document or an envelope.
 * His wife superscribed her own notes on each of his letters before sending them in packets to the editor.
 * 1)  To address (an envelope etc.).