[groff] 13/18: [mm]: Document `V` register as GNU extension.

[G. Branden Robinson]

gbranden pushed a commit to branch master
in repository groff.

commit 9260f9c5ca26b5db626625be7fe4b1a51746cba6
Author: G. Branden Robinson <g.branden.robinson@gmail.com>
AuthorDate: Wed Jan 3 04:55:12 2024 -0600

    [mm]: Document `V` register as GNU extension.
---
 contrib/mm/groff_mm.7.man | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/contrib/mm/groff_mm.7.man b/contrib/mm/groff_mm.7.man
index 237fb3fc7..d0fcb37fa 100644
--- a/contrib/mm/groff_mm.7.man
+++ b/contrib/mm/groff_mm.7.man
@@ -9,7 +9,7 @@ groff_mm \- memorandum macros for GNU
 .\" Legal Terms
 .\" ====================================================================
 .\"
-.\" Copyright (C) 1989-2023 Free Software Foundation, Inc.
+.\" Copyright (C) 1989-2024 Free Software Foundation, Inc.
 .\"
 .\" Permission is granted to make and distribute verbatim copies of this
 .\" manual provided the copyright notice and this permission notice are
@@ -5185,6 +5185,8 @@ is typical.
 .
 The default vertical spacing is 120% of the type size.
 .
+This register is a GNU extension.
+.
 .
 .TP
 .B Verbin