diff --git a/calculator.html b/calculator.html
index 839b37e4..0d587080 100644
--- a/calculator.html
+++ b/calculator.html
@@ -2,16 +2,26 @@
 <title>Calculator</title><meta charset="utf-8">
 <script type="text/javascript">
 
+function inverse() {
+  var num = document.getElementById("n1");
+  num.value = 1/num.value;
+}
+
 function square() {
   var num = document.getElementById("n1");
   num.value = num.value * num.value;
 }
+
 </script>
 </head>
 <body>
+  
+<h1>Calculadora de David Castillo Tamarán</h1>
   Number:
   <input type="text" id="n1"><p>
 
   <button onclick="square()"> x<sup>2</sup> </button>
+  <button onclick="inverse()"> 1/x </button>
+
 </body>
 </html>
