diff --git a/src/index.html b/src/index.html
index 5646263..0989be4 100644
--- a/src/index.html
+++ b/src/index.html
@@ -83,13 +83,19 @@
             </div>
             <div class="float:left">
                 <p class="section">
-                    <strong>Supported Bitwise Operations</strong>
+                    <strong>Supported Bitwise Operations</strong><br/>
+                    <small>
+                        <a href="https://developer.mozilla.org/en/docs/Web/JavaScript/Reference/Operators/Bitwise_Operators">
+                            as implemented in JavaScript engine
+                        </a>
+                    </small>
                 <ul>
                     <li><code>&</code> — bitwise AND</li>
                     <li><code>|</code> — bitwise inclusive OR</li>
                     <li><code>^</code> — bitwise exclusive XOR</li>
                     <li><code><<</code> — left shift</li>
-                    <li><code>>></code> — right shift</li>
+                    <li><code>>></code> — sign propagating right shift</li>
+                    <li><code>>>></code> — zero-fill right shift</li>
                 </ul>
                 </p>
             </div>
diff --git a/src/js/app/bitwise/expression.js b/src/js/app/bitwise/expression.js
index 80028c9..3722092 100644
--- a/src/js/app/bitwise/expression.js
+++ b/src/js/app/bitwise/expression.js
@@ -1,7 +1,7 @@
 app.set('expression', function() {
     "use strict";
 
-    var exprRegex = /^(-?(?:\d+|0x[\d,a-f]+))\s*(<<|>>|\||\&|\^)\s*(-?(?:\d+|0x[\d,a-f]+))$/;
+    var exprRegex = /^(-?(?:\d+|0x[\d,a-f]+))\s*(<<|>>|>>>|\||\&|\^)\s*(-?(?:\d+|0x[\d,a-f]+))$/;
     var listRegex = /^(-?(?:\d+|0x[\d,a-f]+)\s?)+$/;
 
     return {
diff --git a/tests/domain/expressionSpec.js b/tests/domain/expressionSpec.js
index f947c52..fb28034 100644
--- a/tests/domain/expressionSpec.js
+++ b/tests/domain/expressionSpec.js
@@ -18,7 +18,8 @@ describe("expression parse", function() {
         "23^0x1": { operand1: 23, operand2:1, "sign":"^", string: "23^0x1" },
         "0xf>>0xa": { operand1: 15, operand2:10, "sign":">>", string:"0xf>>0xa" },
         "0x10&0x11": { operand1: 0x10, operand2:0x11, "sign":"&", string:"0x10&0x11" },
-        "0x1a^11": { operand1: 0x1a, operand2:11, "sign":"^", string:"0x1a^11" }
+        "0x1a^11": { operand1: 0x1a, operand2:11, "sign":"^", string:"0x1a^11" },
+        "0x1a>>>11": { operand1: 0x1a, operand2:11, "sign":">>>", string:"0x1a>>>11" }
     };
 
     it("should parse expressions", function() {