If FRAMES is nil, apply the font to the selected frame only.
If FRAMES is non-nil, it should be a list of frames to act upon,
-or t meaning all graphical frames. Also, if FRAME is non-nil,
-alter the user's Customization settings as though the
-font-related attributes of the `default' face had been \"set in
-this session\", so that the font is applied to future frames."
+or t meaning all existing graphical frames.
+Also, if FRAMES is non-nil, alter the user's Customization settings
+as though the font-related attributes of the `default' face had been
+\"set in this session\", so that the font is applied to future frames."
(interactive
(let* ((completion-ignore-case t)
(font (completing-read "Font name: "