The Router has a "chip" on its motherboard (firmware) and every so often they (like most companies) improve the features and details held on that chip. It pays to keep the "firmware" updated regularly.
Here is a link to Belkins homepage telling you about this:
http://web.belkin.com/support/downlo...oad=993&lang=1 have a look at the PDF - it will tell you more details about this process.