Don't mention preferred-coding-system.

make-char zeroes 8th bit of code args.

diff --git a/lispref/nonascii.texi b/lispref/nonascii.texi
index 769e13d53423578165031153657b9ecb242798d6..50bed73181fa2e829555796f9d8bc5a9df7a8761 100644 (file)
--- a/lispref/nonascii.texi
+++ b/lispref/nonascii.texi
@@ -325,9 +325,7 @@ belongs to.
 This function returns the charset property list of the character set
 @var{charset}.  Although @var{charset} is a symbol, this is not the same
 as the property list of that symbol.  Charset properties are used for
-special purposes within Emacs; for example,
-@code{preferred-coding-system} helps determine which coding system to
-use to encode characters in a charset.
+special purposes within Emacs.
 @end defun
 
 @node Chars and Bytes
@@ -401,6 +399,11 @@ or both of @var{code1} and @var{code2} according to the dimension of
 (make-char 'latin-iso8859-1 72)
      @result{} 2248
 @end example
+
+Actually, the eighth bit of both @var{code1} and @var{code2} is zeroed
+before they are used to index @var{charset}.  Thus you may use, for
+instance, an ISO 8859 character code rather than subtracting 128, as
+is necessary to index the corresponding Emacs charset.
 @end defun
 
 @cindex generic characters