With the new swap configuration system, I think the diskless(8) man
page needs updating.

I *think* the right things to change (in the CONFIGURATION section)
are:

5.  Delete the "swap=" line and the trailing backslash on the previous
line

7.  Add a statement that you need to create the client's mount point
for swap:
mkdir /export/myclient/root/swap

10.  Add a line to the sample fstab entries, to mount the swap:
server:/export/myclient/swap none swap sw,nfsmntpt=/swap

Cheers,
entropy

--
entropy -- it's not just a good idea, it's the second law.