Document setting up extensionless feed paths

Resolves jekyll#237.
sonicdoe · Jul 10, 2018 · 4cb016b · 4cb016b
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diff --git a/README.md b/README.md
@@ -45,6 +45,8 @@ feed:
 
 To note, you shouldn't have to do this unless you already have a feed you're using, and you can't or wish not to redirect existing subscribers.
 
+:warning: If your feed path does not end with `.xml`, you'll need to configure your web server to serve the proper content type. Alternatively, you can specify e.g. `feed/index.xml` to serve your feed from `/feed/`.
+
 ### Optional front matter
 
 The plugin will use the following post metadata, automatically generated by Jekyll, which you can override via a post's YAML front matter: