diff --git a/examples/pie_chart/main.go b/examples/pie_chart/main.go
index 323734c..1b75aa0 100644
--- a/examples/pie_chart/main.go
+++ b/examples/pie_chart/main.go
@@ -19,6 +19,7 @@ func drawChart(res http.ResponseWriter, req *http.Request) {
 			{Value: 0.2, Label: "Gray"},
 			{Value: 0.1, Label: "Orange"},
 			{Value: 0.1, Label: "??"},
+			{Value: 0.1, Label: "!!"},
 		},
 	}