diff --git a/TODO b/TODO
index 0a5af0a..c79606c 100644
--- a/TODO
+++ b/TODO
@@ -25,5 +25,6 @@ multiple sync connections in one process/config
 relay block-list events
 
 misc
+  ! when disk is full it should log warning but not crash
   periodic reaping of disconnected sockets
   ? websocket-level pings