Update README

README.md

@@ -1,19 +1,35 @@
 # Debian ELTS Advisories
 
-This repository contains security advisories for Debian LTS in JSON format. 
+## Background
 
-TODO:
+- Debian LTS is maintained by the Debian Security team
+- Debian Extended LTS, a commercial offering is maintained by Freexian.
+- Debian ELTS Advisories are announced at https://www.freexian.com/lts/extended/updates/
+- [OSV](https://ossf.github.io/osv-schema/) is a Open Source Vulnerability format, as specified by the [Open Source Security Foundation](https://openssf.org).
+- [GSD Database](https://globalsecuritydatabase.org/) is a vulnerability database used by OSV.dev, and maintained by the [Cloud Security Alliance](https://cloudsecurityalliance.org/)
 
-- [ ] The data is automatically updated.
-- [ ] This will be synced to the GSD repository
-- [ ] Switch to the OSV format.
+## What is this project?
+
+The OSV.dev expects advisories to be published in the OSV format. This repository
+republishes the advisories in the OSV format, and syncs them against the
+[GSD Database](https://github.com/cloudsecurityalliance/gsd-database)
+
+- [x] Picks up data from [extended-lts-security-tracker][source]
+- [x] Generates advisories in the OSV format at advisories/
+- [ ] Syncs Data to the GSD Database
+
+## TODO
+
+- [ ] Add Credits
 
 ## Source:
 
-- Updates are fetched from the LTS Announcements: https://www.freexian.com/lts/extended/updates/
-- as listed via the [Sitemap](https://www.freexian.com/sitemap.xml)
+- Updates are fetched from the ELTS Security Tracker: 
 - The data is also published at https://deb.freexian.com/extended-lts/tracker/data/json, but it doesn't include the announcement URLs, and harder to use.
+- See https://github.com/ossf/osv-schema/pull/104 for more information.
 
 ## License
 
-The code is licensed under MIT.
+The code is licensed under MIT.
+
+[source]: https://salsa.debian.org/freexian-team/extended-lts/security-tracker/-/blob/master/data/ELA/list