using mdx in /blog

[godmar]

Ok, this is a newbie question. The documentation says that I can use mdx for the blog.

How exactly do I do that? If I place an index.mdx instead of index.md in a subdirectory of blog, it's not picked up. If I use index.md and add 'import { }' statements, they are rendered and not processed.

How do I make use of mdx in the /blog directory?

[godmar]

ps: it's more confusing. The documentation says:
"/blog: This directory will contain all your blog posts writted using mdx."
and then
"So, by default inside the doczrc.js configuration file, we're ignoring .mdx inside blog/ folder."

How can you both use mdx for blog posts and at the same time ignore .mdx files?