Selection rules

I have a problem with Panels 3.x
I have built a variant of a panel page, and want the variant to be used when a certain content type is used.
Normally this would be done using selection rules node:type

However I don't have the "node" option in the list now, I just have :
Context exists
PHP code
User: language
User: permission
User: Role

Any ideas as how I get the node option to appear in the selection rules list?

Any help is most welcome.