diff --git a/docs/en/docs/release-notes.md b/docs/en/docs/release-notes.md
index ed1d94cfc..122976f96 100644
--- a/docs/en/docs/release-notes.md
+++ b/docs/en/docs/release-notes.md
@@ -2,6 +2,7 @@
 
 ## Latest Changes
 
+* 📝 Update docs on Pydantic using ujson internally. PR [#5804](https://github.com/tiangolo/fastapi/pull/5804) by [@mvasilkov](https://github.com/mvasilkov).
 * ✏ Rewording in `docs/en/docs/tutorial/debugging.md`. PR [#9581](https://github.com/tiangolo/fastapi/pull/9581) by [@ivan-abc](https://github.com/ivan-abc).
 * ✏️ Fix tooltips for light/dark theme toggler in docs. PR [#9588](https://github.com/tiangolo/fastapi/pull/9588) by [@pankaj1707k](https://github.com/pankaj1707k).
 * 🌐 Add Russian translation for `docs/ru/docs/tutorial/metadata.md`. PR [#9681](https://github.com/tiangolo/fastapi/pull/9681) by [@TabarakoAkula](https://github.com/TabarakoAkula).