diff --git a/windows/RELEASE_NOTES.md b/windows/RELEASE_NOTES.md
index 9c01c54..ae74b01 100644
--- a/windows/RELEASE_NOTES.md
+++ b/windows/RELEASE_NOTES.md
@@ -1,3 +1,6 @@
-## What's new
+## What's new in beta.18
 
-Initial Windows release.
+- Fixed startup crash caused by frozen WPF brushes
+- Added system dark/light theme support (auto-detected, updates every 5 seconds)
+- Native centered window instead of menubar popup
+- Update notifications now work correctly for pre-release builds