diff --git a/src/gui/bubble.vala b/src/gui/bubble.vala
index 5240621..d3dfb74 100644
--- a/src/gui/bubble.vala
+++ b/src/gui/bubble.vala
@@ -26,6 +26,11 @@ class TheCatTools.GUI.Bubble : DrawingAreaOrientable {
         var range = adjustment.upper - adjustment.lower;
         var position_y = radius + (height - 2 * radius) * (val_y - adjustment.lower) / range;
         var position_x = radius + (width - 2 * radius) * (val_x - adjustment.lower) / range;
+        message ("%f %f -> %f %f -> %f %f",
+                 value_x, value_y,
+                 val_x, val_y,
+                 position_x, position_y
+        );
         Utils.set_color_rgba (cr, get_color ());
         cr.arc (position_x, position_y, radius, 0, Math.PI * 2);
         cr.fill ();