diff --git a/crates/ui-egui/src/autoscroll.rs b/crates/ui-egui/src/autoscroll.rs
index 2a04308c6..de0855957 100644
--- a/crates/ui-egui/src/autoscroll.rs
+++ b/crates/ui-egui/src/autoscroll.rs
@@ -152,6 +152,7 @@ impl AutoScroll {
                 Stroke::NONE,
             ));
         }
+        // No pointer position (outside the window) counts as the dead zone: `update` cancels the gesture then.
         let displacement = ui.ctx().input(|i| i.pointer.hover_pos()).map_or(0.0, |p| p.y - anchor.y);
         ui.ctx().set_cursor_icon(cursor_icon(displacement));
     }