diff --git a/TODO.md b/TODO.md
index 2296de53..f94b16bd 100644
--- a/TODO.md
+++ b/TODO.md
@@ -1,5 +1,3 @@
-- should uiWindowOnClosing() really return an int?
-	- if so, should the default return 0 instead of 1?
 - note that uiInitOptions should be initialized to zero
 	- have a cbSize member
 - drop "Page" from uiTab method names? (uiTabAppendPage() -> uiTabAppend())
@@ -61,3 +59,4 @@ notes to self
 	- reconsider this, as the pointer array code does work with the first invalid index...
 		- we would need to test everything else with it
 - note that uiTabInsertPageBefore() does NOT change the current tab page (it may change its index if inserting before the current page)
+- note that the default action for uiWindowOnClosing() is to return 0 (keep the window open)
diff --git a/darwin/window.m b/darwin/window.m
index 3e5749c1..57ce6f7e 100644
--- a/darwin/window.m
+++ b/darwin/window.m
@@ -49,7 +49,7 @@ struct window {
 
 static int defaultOnClosing(uiWindow *w, void *data)
 {
-	return 1;
+	return 0;
 }
 
 static void windowDestroy(uiControl *c)
diff --git a/unix/window.c b/unix/window.c
index fe8cbfcb..1dcbae2a 100644
--- a/unix/window.c
+++ b/unix/window.c
@@ -36,7 +36,7 @@ static gboolean onClosing(GtkWidget *win, GdkEvent *e, gpointer data)
 
 static int defaultOnClosing(uiWindow *w, void *data)
 {
-	return 1;
+	return 0;
 }
 
 static void windowDestroy(uiControl *c)
diff --git a/windows/window.c b/windows/window.c
index c1d77a5b..aa3fddc1 100644
--- a/windows/window.c
+++ b/windows/window.c
@@ -73,7 +73,7 @@ ATOM registerWindowClass(HICON hDefaultIcon, HCURSOR hDefaultCursor)
 
 static int defaultOnClosing(uiWindow *w, void *data)
 {
-	return 1;
+	return 0;
 }
 
 static void windowDestroy(uiControl *c)