diff --git a/basicctrls.go b/basicctrls.go
index 8c97860..4029d4e 100644
--- a/basicctrls.go
+++ b/basicctrls.go
@@ -149,6 +149,7 @@ func NewTextbox() Textbox {
 // - TODO wrapping
 // - TODO set/get integer value
 // - TODO negative values
+// - TODO ensuring values entered in text box stay within bounds
 type Spinbox interface {
 	Control
 }