2 files changed, 17 insertions, 8 deletions

diff --git a/doc/emacs/maintaining.texi b/doc/emacs/maintaining.texi
index b31cacf998a..5c3017a3883 100644
--- a/doc/emacs/maintaining.texi
+++ b/doc/emacs/maintaining.texi
@@ -1987,9 +1987,14 @@ Restart one of the last 2 commands above, from the current location of point.
 
 @kindex M-?
 @findex xref-find-references
-  @kbd{M-?} finds all the references for the identifier at point.  If
-there's no identifier at point, or when invoked with a prefix
-argument, the command prompts for the identifier, with completion.  It
+  @kbd{M-?} finds all the references for the identifier at point,
+prompting for the identifier as needed, with completion.  Depending on
+the current backend (@pxref{Xref}), the command may prompt even if it
+finds a valid identifier at point.  When invoked with a prefix
+argument, it always prompts for the identifier.  (If you want it to
+prompt always, customize the value of the variable
+@code{xref-prompt-for-identifier} to @code{t}; or set it to @code{nil}
+to prompt only if there's no usable identifier at point.)  The command
 then presents the @file{*xref*} buffer with all the references to the
 identifier, showing the file name and the line where the identifier is
 referenced.  The XREF mode commands are available in this buffer, see
diff --git a/doc/lispref/display.texi b/doc/lispref/display.texi
index fef51881977..ea9a305ae2a 100644
--- a/doc/lispref/display.texi
+++ b/doc/lispref/display.texi
@@ -3498,11 +3498,15 @@ cons @code{(@var{from} . @var{to})}, where @var{from} and @var{to} are
 character codepoints.  In that case, use @var{font-spec} for all the
 characters in the range @var{from} and @var{to} (inclusive).
 
-@var{character} may be a charset.  In that case, use
-@var{font-spec} for all character in the charsets.
+@var{character} may be a charset (@pxref{Character Sets}).  In that
+case, use @var{font-spec} for all the characters in the charset.
 
-@var{character} may be a script name.  In that case, use
-@var{font-spec} for all character in the charsets.
+@var{character} may be a script name (@pxref{Character Properties}).
+In that case, use @var{font-spec} for all the characters belonging to
+the script.
+
+@var{character} may be @code{nil}, which means to use @var{font-spec}
+for any character which no font-spec is specified.
 
 @var{font-spec} may be a font-spec object created by the function
 @code{font-spec} (@pxref{Low-Level Font}).
@@ -3512,7 +3516,7 @@ where @var{family} is a family name of a font (possibly including a
 foundry name at the head), @var{registry} is a registry name of a font
 (possibly including an encoding name at the tail).
 
-@var{font-spec} may be a font name string.
+@var{font-spec} may be a font name, a string.
 
 @var{font-spec} may be @code{nil}, which explicitly specifies that
 there's no font for the specified @var{character}.  This is useful,