Changes to google's SSL support

Google are phasing out support for SHA-1 SSL certificates, is this anything we need to update with our Comodo SSL’s? Currently I think we only use Comodo on -

Since your certificates expires in Nov 2015, I wouldn’t worry too much about Google’s deprecation of SHA-1 within their browser. You will most likely have a SHA-2 signed certificate before the end of 2015 when Google’s browser starts showing indicators with regards to SHA-1 certificates that expire beyond 2015.

So how about publishing instructions for people that have certs that expire after 2015? I can’t find any instructions anywhere.