diff --git a/TODO b/TODO
index bf06b5c..f50de46 100644
--- a/TODO
+++ b/TODO
@@ -6,6 +6,8 @@
 
 [DONE] Graceful exit / server shutdown
 
+Don't let sent_states grow without bound for long-sleeping clients
+
 Make roaming much smoother (with error message placement)
 
 Notify if lost contact with server