Ember CLI cannot resolve nested partials

I have a simple partial used in my application.hbs file: {{partial "atoms/header_message"}} The path for the partial is templates/atoms/header_message

According to the CLI Documentation:

The templates are named the same as their filename, minus the extension (i.e. templates/foo/bar.hbs -> foo/bar).

So pod structure or not, it should simply resolve the path. However I get this fancy error:

Uncaught Error: Assertion Failed: Unable to find partial with name "atoms/header_message"

Am I naming things wrong?