diff --git a/Changes.md b/Changes.md
index 5bc60d2d..07b7f8f2 100644
--- a/Changes.md
+++ b/Changes.md
@@ -8,6 +8,7 @@ HEAD
 - Fix a few issues with mobile Web UI styling [#3973, navied]
 - Jobs with `retry: false` now go through the global `death_handlers`,
   meaning you can take action on failed ephemeral jobs. [#3980, Benjamin-Dobell]
+- Fix race condition in defining Workers. [#3997, mattbooks]
 
 5.2.2
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