Why does dhcpd have a routers (plural) option for a subnet?

Ever wondered why there's a "routers" option in dhcpd.conf? I have. Why 
isn't in just "router", as surely you can only have one default gateway? 
Except that's been muddied a bit by MSFT.

Rather than adding a second just to see what happens I thought I'd ask?

I expect it's a mistake in the early days of dhcpd that was too late to 
fix, or left for further expansion.

Thanks, Frank.