How can I change the RSS URL?

Ok, I apologize if I’ve missed something here. What I’ve done is added the following to my site’s config.toml:

[outputFormats]
[outputFormats.RSS]
mediatype = "application/rss"
baseName = "feed"

I tried this alone, as well as adding the stock rss template from the documentation to a file index.feed.xml. However, the only thing that’s generated is the usual /index.xml.

If I use the full config.toml additions that @rdwatters had suggested:

[outputs]
home = ["HTML","FEED"]

[mediaTypes]
[mediaTypes."application/rss"]
suffix = "xml"

[outputFormats]
[outputFormats.FEED]
mediatype = "application/rss"
baseName = "feed"

And then generate the site, again with the /layouts/index.feed.xml in place, I do get a /feed.xml generated.

Am I missing something here?