update changelog info

Author: ethanpalm

guides/changelogs.mdx

@@ -100,8 +100,13 @@ Add `tags` to your `Update` components to replace the table of contents with tag
 
 ### Subscribable changelogs
 
-Using `Update` components creates a subscribable RSS feed at your page URL + `/rss.xml`. For example, `mintlify.com/docs/changelog/rss.xml`. New updates are automatically included in the feed when published.
+Using `Update` components creates a subscribable RSS feed at your page URL with `/rss.xml` appended. For example, `mintlify.com/docs/changelog/rss.xml`.
 
+Entries are added to the RSS feed when new `Update` components are published and when new headings are added inside of existing `<Update>` tags.
+
+The top level headings of `Update` components are used as the titles of RSS feed entries, and the entries link to their heading anchors in your docs.
+
+TODO:
 ```xml Example RSS feed
 <?xml version="1.0" encoding="UTF-8"?><rss xmlns:dc="http://purl.org/dc/elements/1.1/" xmlns:content="http://purl.org/rss/1.0/modules/content/" xmlns:atom="http://www.w3.org/2005/Atom" version="2.0">
     <channel>