Can Applecare be extended?

Limnos,

I'm sorry, but I do not see it. It talks about after it expires to check mysupport, but nothing about extending before it does.

Purchase the new coverage within 30 days after your original coverage ends. To find out if you can purchase the new coverage, go to mysupport.apple.com and follow the onscreen instructions. The new coverage automatically renews until canceled.

It does not tell me anything about renewing or extending coverage. Is there another support article?