# document.markChanged

document.markChanged is a function that is part of the Document Library.
The function flags the current document as changed. It will ask you to save it when you close it.

This has been introduced in TI-Nspire OS 3.0 (Changes).

## Syntax

document.markChanged()
No arguments

Turns the 'changed' flag on.

## Example

--[[
Code that modifies the current document
..
..
--]]

document.markChanged() --ask the user to save the document when closing it