diff --git a/docs/release-notes.md b/docs/release-notes.md
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@@ -1,5 +1,7 @@
 ## Latest changes
 
+* Fix parsing a body type declared with `Union`. PR [#400](https://github.com/tiangolo/fastapi/pull/400) by [@koxudaxi](https://github.com/koxudaxi).
+
 ## 0.34.0
 
 * Upgrade Starlette supported range to include the latest `0.12.7`. The new range is `0.11.1,<=0.12.7`. PR [#367](https://github.com/tiangolo/fastapi/pull/367) by [@dedsm](https://github.com/dedsm).