diff --git a/lisp/face-remap.el b/lisp/face-remap.el
index d269d85301c..b9fdad2be17 100644
--- a/lisp/face-remap.el
+++ b/lisp/face-remap.el
@@ -387,9 +387,10 @@ this are the `default' and `header-line' faces: they will both be
 scaled even if they have an explicit `:height' setting.
 
 See also the related command `global-text-scale-adjust'.  Unlike
-that command, which scales the font size with a increment,
-`text-scale-adjust' scales the font size with a factor,
-`text-scale-mode-step'.  With a small `text-scale-mode-step'
+that command, which scales the font size with a increment (and can
+also optionally resize frames to keep the same number of lines and
+characters per line), `text-scale-adjust' scales the font size with
+a factor, `text-scale-mode-step'.  With a small `text-scale-mode-step'
 factor, the two commands behave similarly."
   (interactive "p")
   (let ((ev last-command-event)