static arp entries disappearing on reboot

I tried an experiment and added a static arp entry for my router and my
other computer on my Windows 98SE computer. It worked, but after I
turned the computer off for the night, the next day the entries were
gone. The next day I did the same thing and this morning again the arp
only has a dynamic entry for my router.
According to the built-in help from doing "arp /?"
-s Adds the host and associates the Internet addressinet_addr
with the Physical address eth_addr. The Physical
address is given as 6 hexadecimal bytes separated by
hyphens. The entry is permanent.
I thought "the entry is permanent" meant that it would write to some
config file and persist after reboot. Is this normal behavior normal, or
is something screwed up? If it's normal, how do I make a static arp
entry that will remain after reboot short of running a batch file at
startup? I could possibly understand it going away if this was a server
OS like NT4 Server (2000 wasn't around when this OS was released let
alone 2003, so I'm going with the times), but a client OS like Windows
98SE would be shut down regularly. Having static arp entries flushed on
reboot would be an administrative nightmare if you have 50 clients to fix.