diff --git a/docs/en/docs/release-notes.md b/docs/en/docs/release-notes.md
index 17d75ca2e..4286c9dad 100644
--- a/docs/en/docs/release-notes.md
+++ b/docs/en/docs/release-notes.md
@@ -2,6 +2,7 @@
 
 ## Latest changes
 
+* Improve internal typing, declare `Optional` parameters. PR [#1731](https://github.com/tiangolo/fastapi/pull/1731) by [@MashhadiNima](https://github.com/MashhadiNima).
 * Add external link [Deploy FastAPI on Azure App Service](https://www.tutlinks.com/deploy-fastapi-on-azure/) to docs. PR [#1726](https://github.com/tiangolo/fastapi/pull/1726) by [@windson](https://github.com/windson).
 * Add link to Starlette docs about WebSocket testing. PR [#1717](https://github.com/tiangolo/fastapi/pull/1717) by [@hellocoldworld](https://github.com/hellocoldworld).
 * Refactor generating dependant, merge for loops. PR [#1714](https://github.com/tiangolo/fastapi/pull/1714) by [@Bloodielie](https://github.com/Bloodielie).