diff --git a/todo.md b/todo.md
index 919f7f5..a248eff 100644
--- a/todo.md
+++ b/todo.md
@@ -19,6 +19,7 @@ super ultra important things:
 	- figure out what to do about dragging into or out of a window; will likely need to be undefined as well...
 - pin down whether or not a click event gets sent if this click changes from a different window to the one with the Area
 - determine if, on Mac OS X, dragging with two mouse buttons triggers both xxxMouseDragged: events
+- figure out what happens if the mouse button is held on another application, then dragged over an Area without activating that window
 - double-check to make sure MouseEvent.Held[] is sorted on all platforms
 - cap click count to 2 on all platforms
 - the windows build appears to be unstable: