From c3ac38156d7668879ad9f657c762febf341d49f5 Mon Sep 17 00:00:00 2001
From: Charles Forsyth <charles.forsyth@gmail.com>
Date: Sun, 23 Dec 2018 13:10:38 +0000
Subject: add -pprefix -t [trace] options to m4

---
 man/1/m4 | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)

(limited to 'man')

diff --git a/man/1/m4 b/man/1/m4
index ef0670a3..08a50990 100644
--- a/man/1/m4
+++ b/man/1/m4
@@ -4,6 +4,12 @@ m4 \- macro processor
 .SH SYNOPSIS
 .B m4
 [
+.BI -p prefix
+]
+[
+.B -t
+]
+[
 .BI -D name = value
 ] [
 .BI -Q name = value
@@ -236,7 +242,20 @@ Text may be undiverted into another diversion.
 Undiverting discards the diverted text.
 .PD
 .PP
+The
+.B -p
+option causes
+.I m4
+to add the given prefix character to the names of predefined macros;
+typically the
+.I prefix
+is a Unicode character, to reduce the chance of a clash with macro names in the input text.
+The
+.B -t
+option produces a trace on standard error.
+.PP
 .I M4
+otherwise
 interprets its command line options after installing the predefined macro set.
 The
 .B -D
-- 
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