Index: head/share/man/man5/boot.config.5
===================================================================
--- head/share/man/man5/boot.config.5
+++ head/share/man/man5/boot.config.5
@@ -23,7 +23,7 @@
 .\" SUCH DAMAGE.
 .\"
 .\" $FreeBSD$
-.Dd May 13, 2007
+.Dd July 13, 2017
 .Dt BOOT.CONFIG 5
 .Os
 .Sh NAME
@@ -75,8 +75,9 @@
 # echo "-P" > /boot.config
 .Ed
 .Pp
-will activate the serial console of
-.Fx .
+activates the serial console if no keyboard is detected.
+Note: any system with a BMC will provide a keyboard, and thus defeat this
+check.
 .Pp
 The command:
 .Bd -literal -offset indent