diff --git a/CHANGELOG.md b/CHANGELOG.md
index c17e4cb..1f23115 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,8 @@
+## Unreleased
+- Improved performance
+  - SystemHeat resource converters now fully disable themselves when inactive.
+  - Several other optimizations to make resource converters faster.
+
 ## 0.9.0 - 2026-05-08
 
 - Fixed memory leaks from dangling event handlers.