git-mailinfo: document the -n option

Signed-off-by: Lukas Sandström <lukass@etek.chalmers.se>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

Documentation/git-mailinfo.txt

@@ -8,7 +8,7 @@ git-mailinfo - Extracts patch and authorship from a single e-mail message
 
 SYNOPSIS
 --------
-'git-mailinfo' [-k] [-u | --encoding=<encoding>] <msg> <patch>
+'git-mailinfo' [-k] [-u | --encoding=<encoding> | -n] <msg> <patch>
 
 
 DESCRIPTION
@@ -46,6 +46,9 @@ conversion, even with this flag.
 	from what is specified by i18n.commitencoding, this flag
 	can be used to override it.
 
+-n::
+	Disable all charset re-coding of the metadata.
+
 <msg>::
 	The commit log message extracted from e-mail, usually
 	except the title line which comes from e-mail Subject.

builtin-mailinfo.c

@@ -960,7 +960,7 @@ static int mailinfo(FILE *in, FILE *out, int ks, const char *encoding,
 }
 
 static const char mailinfo_usage[] =
-	"git-mailinfo [-k] [-u | --encoding=<encoding>] msg patch <mail >info";
+	"git-mailinfo [-k] [-u | --encoding=<encoding> | -n] msg patch <mail >info";
 
 int cmd_mailinfo(int argc, const char **argv, const char *prefix)
 {