diff --git a/api/controller.js b/api/controller.js
index 100fc02..f7a0f4c 100644
--- a/api/controller.js
+++ b/api/controller.js
@@ -15,6 +15,8 @@ exports.calculate = function(req, res) {
     'subtract': function(a, b) { return a - b },
     'multiply': function(a, b) { return a * b },
     'divide':   function(a, b) { return a / b },
+    // 'modulo':   function(a, b) { return a % b },
+    'power':    function(a, b) { return Math.pow(a, b) }
   };
 
   if (!req.query.operation) {
diff --git a/public/client.js b/public/client.js
index 612f1b9..48b030e 100644
--- a/public/client.js
+++ b/public/client.js
@@ -32,6 +32,12 @@ function calculate(operand1, operand2, operation) {
         case '/':
             uri += "?operation=divide";
             break;
+        // case '%':
+        //     uri += "?operation=modulo";
+        //     break;
+        case '^':
+            uri += "?operation=power";
+            break;
         default:
             setError();
             return;
diff --git a/public/index.html b/public/index.html
index db09b0b..0572060 100644
--- a/public/index.html
+++ b/public/index.html
@@ -39,6 +39,8 @@
             <button class="btn" onClick="decimalPressed()">.</button>
             <button class="btn" onClick="operationPressed('+')">+</button>
             <button class="btn" onClick="equalPressed()">=</button>
+            <!-- <button class="btn" onClick="operationPressed('%')">%</button> -->
+            <button class="btn" onClick="operationPressed('^')">^</button>
 
           </div>
         </div>