1 files changed, 1 insertions, 0 deletions

diff --git a/todo.md b/todo.md
index bd3ee12..943cd9d 100644
--- a/todo.md
+++ b/todo.md
@@ -17,6 +17,7 @@ so I don't forget:
 - Combobox/Listbox.DeleteAll
 - Combobox/Listbox.Select (with Listbox.Select allowing bulk)
 - Listbox.SelectAll
+- have Combobox.InsertBefore, Listbox.InsertBefore, Combobox.Delete, and Listbox.Delete return an error on invalid index
 
 super ultra important things:
 - the windows build appears to be unstable: