diff --git a/CHANGELOG.md b/CHANGELOG.md
index 091fe50..86a7b03 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -7,6 +7,12 @@ Format follows [Keep a Changelog](https://keepachangelog.com/en/1.0.0/).
 
 ## [Unreleased]
 
+### Performance
+- **Event-queue timers** (Issue #36): crops, tree seedlings, and tile-recovery events now use a sorted priority queue with absolute `gameTime` timestamps instead of per-frame countdown iteration — O(due items) per tick instead of O(total items); `WorldState.gameTime` tracks the in-game clock; save migrated from v5 to v6
+
+### Added
+- **Action log in F3 debug panel** (Issue #37): last 15 actions dispatched through the adapter are shown in the F3 overlay under "Last Actions"; ring buffer maintained in `LocalAdapter`
+
 ### Fixed
 - **Y-based depth sorting** (Issue #31): trees, rocks, seedlings and buildings now use `tileY + 5` as depth instead of fixed values — objects lower on screen always render in front of objects above them, regardless of spawn order; build ghost moved to depth 1000
 - **Nisse always visible** (Issue #33): Nisse sprites fixed at depth 900, always rendered above world objects