2 files changed, 6 insertions, 1 deletions

diff --git a/doc/lispref/help.texi b/doc/lispref/help.texi
index 0b8182c521a..58a11f29a4c 100644
--- a/doc/lispref/help.texi
+++ b/doc/lispref/help.texi
@@ -362,6 +362,10 @@ this'} with grave accent and apostrophe, the standard style
 before Emacs version 25.  The default value @code{nil}
 acts like @code{curve} if curved single quotes are displayable, and
 like @code{grave} otherwise.
+
+This variable can be used by experts on platforms that have problems
+with curved quotes.  As it is not intended for casual use, it is not a
+user option.
 @end defvar
 
 @defun substitute-command-keys string
diff --git a/etc/NEWS b/etc/NEWS
index 7bedcedae63..a50469c0f56 100644
--- a/etc/NEWS
+++ b/etc/NEWS
@@ -1472,7 +1472,8 @@ Set it to 'curve' for curved single quotes, to 'straight' for straight
 apostrophes, and to 'grave' for grave accent and apostrophe.  The
 default value nil acts like 'curve' if curved single quotes are
 displayable, and like 'grave' otherwise.  The new variable affects
-display of diagnostics and help, but not of info.
+display of diagnostics and help, but not of info.  As the variable is
+not intended for casual use, it is not a user option.
 
 +++
 ** substitute-command-keys now replaces quotes.