diff --git a/TODO.md b/TODO.md
index eafa69c..0f8e070 100644
--- a/TODO.md
+++ b/TODO.md
@@ -5,4 +5,4 @@
 - ❌ Send relevant entity URIs to client; cache and use instead of full transfer
 - ✔ Forget remembered entities after a while
 - ❌ Optimize informed and Packer::pack: don't use .map on immutables
-- ❌ Optimize Damaging::tick
+- ✔ Optimize Damaging::tick