diff --git a/todo.txt b/todo.txt
index 98a436287..0cfafe361 100644
--- a/todo.txt
+++ b/todo.txt
@@ -2,6 +2,7 @@
 PUNCHDOWN LIST
 
 * perf wup @ rgp.md
+* note somewhere why NewEndOfStreamMarker instead of channel close -- readers carry final context
 
 * blockers:
   - keep checking issues