diff --git a/History.markdown b/History.markdown
index 194c2ea9..7497786f 100644
--- a/History.markdown
+++ b/History.markdown
@@ -17,6 +17,7 @@
   * Add v3.9.3 release history & post to `master` branch (#9284)
   * Update S3 deployment to remove s3_website (#9221)
   * Document Exclude behavior, Include overrides and the default exclusion list (#9376)
+  * Update macos.md, remove Catalina (macOS 10.15) (#9405)
 
 ### Development Fixes