diff --git a/docs/release-notes.md b/docs/release-notes.md
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--- a/docs/release-notes.md
+++ b/docs/release-notes.md
@@ -1,5 +1,7 @@
 ## Latest changes
 
+* Fix preserving custom route class in routers when including other sub-routers. PR [#538](https://github.com/tiangolo/fastapi/pull/538) by [@dmontagu](https://github.com/dmontagu).
+
 ## 0.40.0
 
 * Add notes to docs about installing `python-multipart` when using forms. PR [#574](https://github.com/tiangolo/fastapi/pull/574) by [@sliptonic](https://github.com/sliptonic).