diff --git a/TODO.md b/TODO.md
index b197c49..a564818 100644
--- a/TODO.md
+++ b/TODO.md
@@ -3,3 +3,4 @@
 - ✔ React UI
 - ❌ Multiple rooms
 - ❌ Send relevant entity URIs to client; cache and use instead of full transfer
+- ❌ Forget remembered entities after a while