diff --git a/todo.md b/todo.md
index 77de3e6..bd3ee12 100644
--- a/todo.md
+++ b/todo.md
@@ -39,3 +39,8 @@ far off:
 maybe:
 - rename Stack to Box?
 - make Combobox and Listbox satisfy sort.Interface?
+- this:
+	[16:27] <cespare> pietro10: depends what you mean by safe
+	[16:27] <cespare> pietro10: sounds like you should move this functionality into a function though.
+	[16:28] <cespare> (so the user can decide what to do with the error)
+	[16:28] <cespare> typically people don't like their libraries calling exit :)