not-modified

not-modified is an interactive compiled Lisp function in `files.el'.

It is bound to M-~.

(not-modified &optional ARG)

This function is for interactive use only;
in Lisp code use `set-buffer-modified-p' instead.

Mark current buffer as unmodified, not needing to be saved.
With prefix ARG, mark buffer as modified, so C-x C-s will save.

It is not a good idea to use this function in Lisp programs, because it
prints a message in the minibuffer. Instead, use `set-buffer-modified-p'.