diff --git a/docs/en/docs/release-notes.md b/docs/en/docs/release-notes.md
index 17ecbd136..1bea3f1f7 100644
--- a/docs/en/docs/release-notes.md
+++ b/docs/en/docs/release-notes.md
@@ -7,6 +7,10 @@ hide:
 
 ## Latest Changes
 
+### Fixes
+
+* 🐛 Refactor router route building to make it thread-safe, mainly relevant for tests running in parallel threads (uncommon). PR [#16013](https://github.com/fastapi/fastapi/pull/16013) by [@tiangolo](https://github.com/tiangolo).
+
 ## 0.139.1 (2026-07-16)
 
 ### Fixes