added comment

src/polyline2d.scad

@@ -44,6 +44,7 @@ module polyline2d(points, width, startingStyle = "CAP_SQUARE", endingStyle = "CA
     polyline2d_inner(1);
 }
 
+// override it to test
 module test_line_segment(index, point1, point2, width, p1Style, p2Style) {
 
 }