diff --git a/javascript/graph.js b/javascript/graph.js
index aa24928..4b44121 100644
--- a/javascript/graph.js
+++ b/javascript/graph.js
@@ -1,6 +1,6 @@
 
 class Graph {
-    constructor(draw, options) {
+    constructor(draw, options = {}) {
 	this.draw = draw;
 	this.dots = []
 	this.tris = []