route for the blog collection index

Hi,

I am brand new to statamic, so still wrapping my head around it all. I have created a collection called blogs for my blog posts.

I used the scaffolding to create an index and show file. I have updated the collection route to blog/{slug_field} so I can go directly to a blog post, this works

but I cannot for the life of me work out what the route should be for the index.

if I go to /blog or /blogs I get a 404,

Does this need setting some where?

Thanks