1 files changed, 1 insertions, 0 deletions
diff --git a/area.go b/area.go
index 5df46cd..5d1ef08 100644
--- a/area.go
+++ b/area.go
@@ -62,6 +62,7 @@ type MouseEvent struct {
 
 	// If the event was generated by a mouse button being released, Up contains the ID of that button.
 	// Otherwise, Up contains 0.
+	// If both Down and Up are 0, the event represents mouse movement (with optional held buttons; see below).
 	Up			uint
 
 	// If Down is nonzero, Count indicates the number of clicks: 1 for single-click, 2 for double-click.