===================================================================
RCS file: /cvsrepo/anoncvs/cvs/src/usr.bin/ssh/ssh_config.5,v
retrieving revision 1.361
retrieving revision 1.362
diff -u -r1.361 -r1.362
--- src/usr.bin/ssh/ssh_config.5	2021/08/06 05:04:42	1.361
+++ src/usr.bin/ssh/ssh_config.5	2021/08/12 23:59:25	1.362
@@ -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 1.361 2021/08/06 05:04:42 dtucker Exp $
-.Dd $Mdocdate: August 6 2021 $
+.\" $OpenBSD: ssh_config.5,v 1.362 2021/08/12 23:59:25 djm Exp $
+.Dd $Mdocdate: August 12 2021 $
 .Dt SSH_CONFIG 5
 .Os
 .Sh NAME
@@ -377,10 +377,21 @@
 by certificate authorities (CAs).
 The default is:
 .Bd -literal -offset indent
-ssh-ed25519,ecdsa-sha2-nistp256,ecdsa-sha2-nistp384,ecdsa-sha2-nistp521,
-sk-ssh-ed25519@openssh.com,sk-ecdsa-sha2-nistp256@openssh.com,
+ssh-ed25519,ecdsa-sha2-nistp256,
+ecdsa-sha2-nistp384,ecdsa-sha2-nistp521,
+sk-ssh-ed25519@openssh.com,
+sk-ecdsa-sha2-nistp256@openssh.com,
 rsa-sha2-512,rsa-sha2-256
 .Ed
+.Pp
+If the specified list begins with a
+.Sq +
+character, then the specified algorithms will be appended to the default set
+instead of replacing them.
+If the specified list begins with a
+.Sq -
+character, then the specified algorithms (including wildcards) will be removed
+from the default set instead of replacing them.
 .Pp
 .Xr ssh 1
 will not accept host certificates signed using algorithms other than those