added comment

tools.descartes.pavo/src/tools/descartes/pavo/types/ScatterPlot.java

@@ -73,6 +73,9 @@ public class ScatterPlot extends AbstractVisualizationType implements IVisualiza
 		plot.setRangeGridlinePaint(Color.lightGray);
 		plot.setDomainGridlinePaint(Color.lightGray);
 
+		// TODO improve legend formatting
+		// https://stackoverflow.com/questions/13307500/how-to-display-legend-for-pie-chart-in-columns/13309587#13309587
+
 		return chart;
 
 	}