diff --git a/docs/en/docs/release-notes.md b/docs/en/docs/release-notes.md
index 05c90b1bf9..3d2b4063f2 100644
--- a/docs/en/docs/release-notes.md
+++ b/docs/en/docs/release-notes.md
@@ -7,6 +7,10 @@ hide:
 
 ## Latest Changes
 
+### Refactors
+
+* ♻️ Do not accept underscore headers when using `convert_underscores=True` (the default). PR [#15589](https://github.com/fastapi/fastapi/pull/15589) by [@tiangolo](https://github.com/tiangolo).
+
 ## 0.136.2 (2026-05-23)
 
 ### Refactors