From 99834f6d3675e9f695c4600e881c716814182c8c Mon Sep 17 00:00:00 2001
From: djm <djm@openbsd.org>
Date: Tue, 15 Feb 2022 05:13:36 +0000
Subject: [PATCH] document the unbound/host-bound options to
 PubkeyAuthentication; spotted by HARUYAMA Seigo

---
 usr.bin/ssh/ssh_config.5 | 15 +++++++++++----
 1 file changed, 11 insertions(+), 4 deletions(-)

diff --git a/usr.bin/ssh/ssh_config.5 b/usr.bin/ssh/ssh_config.5
index 3672329fbf0..7b5827373ae 100644
--- a/usr.bin/ssh/ssh_config.5
+++ b/usr.bin/ssh/ssh_config.5
@@ -33,8 +33,8 @@
 .\" (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 .\" THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 .\"
-.\" $OpenBSD: ssh_config.5,v 1.368 2022/02/04 02:49:17 dtucker Exp $
-.Dd $Mdocdate: February 4 2022 $
+.\" $OpenBSD: ssh_config.5,v 1.369 2022/02/15 05:13:36 djm Exp $
+.Dd $Mdocdate: February 15 2022 $
 .Dt SSH_CONFIG 5
 .Os
 .Sh NAME
@@ -1522,9 +1522,16 @@ The list of available signature algorithms may also be obtained using
 Specifies whether to try public key authentication.
 The argument to this keyword must be
 .Cm yes
-(the default)
+(the default),
+.Cm no ,
+.Cm unbound
 or
-.Cm no .
+.Cm host-bound .
+The final two options enable public key authentication while respectively
+disabling or enabling the OpenSSH host-bound authentication protocol
+extension required for restricted
+.Xr ssh-agent 1
+forwarding.
 .It Cm RekeyLimit
 Specifies the maximum amount of data that may be transmitted before the
 session key is renegotiated, optionally followed by a maximum amount of
-- 
2.20.1