===================================================================
RCS file: /cvsrepo/anoncvs/cvs/src/usr.bin/ssh/ssh-keygen.1,v
retrieving revision 1.199
retrieving revision 1.200
diff -u -r1.199 -r1.200
--- src/usr.bin/ssh/ssh-keygen.1	2020/02/03 08:15:37	1.199
+++ src/usr.bin/ssh/ssh-keygen.1	2020/02/04 09:58:04	1.200
@@ -1,4 +1,4 @@
-.\"	$OpenBSD: ssh-keygen.1,v 1.199 2020/02/03 08:15:37 jmc Exp $
+.\"	$OpenBSD: ssh-keygen.1,v 1.200 2020/02/04 09:58:04 djm Exp $
 .\"
 .\" Author: Tatu Ylonen <ylo@cs.hut.fi>
 .\" Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
@@ -35,7 +35,7 @@
 .\" (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 .\" THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 .\"
-.Dd $Mdocdate: February 3 2020 $
+.Dd $Mdocdate: February 4 2020 $
 .Dt SSH-KEYGEN 1
 .Os
 .Sh NAME
@@ -472,6 +472,8 @@
 Override the default FIDO application/origin string of
 .Dq ssh: .
 This may be useful when generating host or domain-specific resident keys.
+The specified application string must begin with
+.Dq ssh: .
 .It Cm challenge Ns = Ns Ar path
 Specifies a path to a challenge string that will be passed to the
 FIDO token during key generation.