personalnote
nounUK /ˈpɜː.sən.əl nəʊt/
US /ˈpɝː.sən.əl noʊt/
A personal note is a short message you write yourself to someone you know.
She added a personal note to the birthday card.
OTHER MEANINGS
2. A private written reminder that you keep for yourself.
He left a personal note on his desk to buy milk.
3. A short comment in a book or document written by its owner.
There was a personal note in the margin of the old book.
4. A warm, individual touch added to something.
The handmade gift had a personal note that made it special.