diff --git a/package.json b/package.json
index 104230d174..2e50090deb 100644
--- a/package.json
+++ b/package.json
@@ -9,7 +9,7 @@
     "prepublishOnly": "npm run build",
     "lint": "tslint --project ./ts",
     "build": "rimraf ./build && tsc -p ts",
-    "demo": "npm run build && node ./demo"
+    "demo": "npm run build && node ./demo",
     "typedoc": "rimraf ./docs && typedoc --out docs/ ts/ --module commonjs --target ES6"
   },
   "files": [