1. You create a blog named “Product Reviews”
2. You create blog entries with the same title as your product. The content doesn’t matter, but I would advise including a link back to the product, since your users will end up here after posting their comment
3. Shopify now displays all the comments to the blog post you just created on the product page with the same title !

You can find more information about this method on the shopify forums

1. Click the “Blogs & Pages” tab
2. Press “Create Blog or Page”
3. Type RSS in the form field
4. Submit the form (Create new Page)
5. Leave the description blank (Write your Page)
6. Submit the form (Post Page)

1. Click the “Collections” tab
2. Press “Create new Collection”
3. Type All in the title field
4. Click the “Smart Collection” radio button
5. Set conditions to product price is greater than 0
6. Submit the form (Create Collection)

That’s it ! Your product feed should now be working.

Instructions taken from the Vogue theme blog

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We automatically create an Atom Feed for all your blog posts.
This allows your customers to subscribe to new articles using one of many feed readers (e.g. Google Reader, News Gator, Bloglines).