diff --git a/index.html b/index.html
index e48c092..9717bef 100644
--- a/index.html
+++ b/index.html
@@ -10,10 +10,14 @@
   function plus (a, b) {
     return a+b;
   }
-  
+
   function divide(a, b) {
     return a/b;
   }
+
+  function minus(a, b) {
+    return a-b;
+  }
 </script>
 </body>
 </html>