[Custom Feature Question] A menu option to store text

I did a brisk search to see if this was already addressed, and I was unable to find it.

In my game, I want the player to have access to an object (either a key item or a menu tab) that will keep track of text that they are given over the course of the game. "Notes", let's say.

I assume it's really simple?

Do you mean a text log of all the message boxes that appeared? Or only specific texts?