diff --git a/TODO.md b/TODO.md
index af668b00..ea863317 100644
--- a/TODO.md
+++ b/TODO.md
@@ -42,6 +42,8 @@
 - menu item state change while the menu is visible (not in response to user action)
 - figure out where we should return HRESULTs
 - Windows: don't abort if a cleanup function fails?
+- should uiWindowOnClosing() really return an int?
+	- if so, should the default return 0 instead of 1?
 
 ultimately:
 - add some sort of runtime type checking
diff --git a/ui.idl b/ui.idl
index 2f44f58c..76d6fee6 100644
--- a/ui.idl
+++ b/ui.idl
@@ -61,7 +61,6 @@ func MakeContainer(c *Container);
 interface Window from Control {
 	func Title(void) *char;
 	func SetTitle(title *const char);
-	// TODO really return int?
 	func OnClosing(f *func(w *Window, data *void) int, data *void);
 	func SetChild(c *Control);
 	func Margined(void) int;