README.md in govuk_content_models-39.0.0 vs README.md in govuk_content_models-40.0.0

@@ -1,5 +1,8 @@
 # GOV.UK Content Models
 
-A gem containing the shared models for the GOV.UK publishing platform, including [Panopticon](https://github.com/alphagov/panopticon) and [Publisher](https://github.com/alphagov/publisher).
+A gem containing the shared models for the old GOV.UK publishing applications:
 
-This is a continual **work in progress**.
+- [Panopticon](https://github.com/alphagov/panopticon)
+- [Publisher](https://github.com/alphagov/publisher).
+- [Content API](https://github.com/alphagov/govuk_content_api)
+