===================================================================
RCS file: /cvsrepo/anoncvs/cvs/src/usr.bin/ssh/sshd_config.5,v
retrieving revision 1.206
retrieving revision 1.207
diff -u -r1.206 -r1.207
--- src/usr.bin/ssh/sshd_config.5	2015/07/10 06:21:53	1.206
+++ src/usr.bin/ssh/sshd_config.5	2015/07/20 00:30:01	1.207
@@ -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: sshd_config.5,v 1.206 2015/07/10 06:21:53 markus Exp $
-.Dd $Mdocdate: July 10 2015 $
+.\" $OpenBSD: sshd_config.5,v 1.207 2015/07/20 00:30:01 djm Exp $
+.Dd $Mdocdate: July 20 2015 $
 .Dt SSHD_CONFIG 5
 .Os
 .Sh NAME
@@ -1494,11 +1494,20 @@
 .It Cm UseDNS
 Specifies whether
 .Xr sshd 8
-should look up the remote host name and check that
+should look up the remote host name, and to check that
 the resolved host name for the remote IP address maps back to the
 very same IP address.
-The default is
-.Dq no .
+.Pp
+If this option is set to
+.Dq no
+(the default) then only addresses and not host names may be used in
+.Pa ~/.ssh/known_hosts
+.Cm from
+and
+.Xr sshd_config 5
+.Cm Match
+.Cm Host
+directives.
 .It Cm UseLogin
 Specifies whether
 .Xr login 1