diff --git a/selfdrive/ui/ui.cc b/selfdrive/ui/ui.cc
index e1ef5192b6..945218ec11 100644
--- a/selfdrive/ui/ui.cc
+++ b/selfdrive/ui/ui.cc
@@ -63,7 +63,7 @@ void update_line_data(const UIState *s, const cereal::ModelDataV2::XYZTData::Rea
   right_points.reserve(max_idx + 1);
 
   for (int i = 0; i <= max_idx; i++) {
-    // highly negative x positions cause flickering, clip to zy plane of camera
+    // highly negative x positions  are drawn above the frame and cause flickering, clip to zy plane of camera
     if (line_x[i] < 0) continue;
     QPointF left, right;
     bool l = calib_frame_to_full_frame(s, line_x[i], line_y[i] - y_off, line_z[i] + z_off, &left);