added "see also" refs to cdio & chio

diff --git a/lib/libc/sys/ioctl.2 b/lib/libc/sys/ioctl.2
index 9eb6001..1c3d6d6 100644 (file)
--- a/lib/libc/sys/ioctl.2
+++ b/lib/libc/sys/ioctl.2
@@ -98,6 +98,8 @@ is not valid.
 .El
 .Sh SEE ALSO
 .Xr mt 1 ,
+.Xr cdio 1 ,
+.Xr chio 1 ,
 .Xr execve 2 ,
 .Xr fcntl 2 ,
 .Xr tty 4 ,