From 9aca30d87804b9b9f646f9ef3ad5ae6af81fd40a Mon Sep 17 00:00:00 2001
From: Koichiro Iwao <meta@FreeBSD.org>
Date: Tue, 20 Jun 2023 19:14:39 +0900
Subject: [PATCH] ifconfig.8: Document limitation of groupname

Approved by:		kp
MFC after:		1 week
Differential Revision:	https://reviews.freebsd.org/D40645
---
 sbin/ifconfig/ifconfig.8 | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/sbin/ifconfig/ifconfig.8 b/sbin/ifconfig/ifconfig.8
index 13685eba4c39..6c51b8758b02 100644
--- a/sbin/ifconfig/ifconfig.8
+++ b/sbin/ifconfig/ifconfig.8
@@ -28,7 +28,7 @@
 .\"     From: @(#)ifconfig.8	8.3 (Berkeley) 1/5/94
 .\" $FreeBSD$
 .\"
-.Dd June 13, 2023
+.Dd June 20, 2023
 .Dt IFCONFIG 8
 .Os
 .Sh NAME
@@ -509,6 +509,9 @@ This action does not automatically disable routes using the interface.
 .It Cm group Ar groupname
 Assign the interface to a
 .Dq group .
+The
+.Ar groupname
+may not be longer than 15 characters and must not end in a digit.
 Any interface can be in multiple groups.
 .Pp
 Cloned interfaces are members of their interface family group by default.