diff --git a/index.html b/index.html
index bb68247..d3070f2 100644
--- a/index.html
+++ b/index.html
@@ -6,6 +6,10 @@
   <script src="https://code.jquery.com/jquery-1.12.4.js"></script>
 </head>
 <body>
-
+<script>
+  function plus (a, b) {
+    return a+b;
+  }
+</script>
 </body>
 </html>
