diff --git a/TODO.md b/TODO.md
index 5a49442b..8f9fdc1d 100644
--- a/TODO.md
+++ b/TODO.md
@@ -1,3 +1,7 @@
+- windows: should the initial hwndInsertAfter be HWND_BOTTOM for what we want?
+
+- windows: document the rules for controls and containers
+
 - windows: document the minimum size change propagation system
 
 - provisions for controls that cannot be grown? especiailly for windows
diff --git a/windows/tabpage.cpp b/windows/tabpage.cpp
index b1df4c05..d1124ee4 100644
--- a/windows/tabpage.cpp
+++ b/windows/tabpage.cpp
@@ -32,8 +32,8 @@ static void tabPageRelayout(struct tabPage *tp)
 	tabPageMargins(tp, &mx, &my);
 	r.left += mx;
 	r.top += my;
-	r.right -= 2 * mx;
-	r.bottom -= 2 * my;
+	r.right -= mx;
+	r.bottom -= my;
 	child = (HWND) uiControlHandle(tp->child);
 	uiWindowsEnsureMoveWindowDuringResize(child, r.left, r.top, r.right - r.left, r.bottom - r.top);
 }