diff --git a/README.md b/README.md
index 4ab7fcf..87453a6 100644
--- a/README.md
+++ b/README.md
@@ -26,6 +26,15 @@ $validator->validate('(function xss(x){evil()})');
 // returns `false`
 ```
 
+Or as a static method:
+
+```php
+\JsonpCallbackValidator::validate('JSONP.callback');
+// returns `true`
+
+\JsonpCallbackValidator::validate('(function xss(x){evil()})');
+// returns `false`
+```
 
 Installation
 ------------
diff --git a/src/JsonpCallbackValidator.php b/src/JsonpCallbackValidator.php
index 40a4c1e..7b31c66 100644
--- a/src/JsonpCallbackValidator.php
+++ b/src/JsonpCallbackValidator.php
@@ -8,9 +8,9 @@
  */
 class JsonpCallbackValidator
 {
-    private $regexp = '/^[a-zA-Z_$][0-9a-zA-Z_$]*(?:\[(?:"(?:\\\.|[^"\\\])*"|\'(?:\\\.|[^\'\\\])*\'|\d+)\])*?$/';
+    private static $regexp = '/^[a-zA-Z_$][0-9a-zA-Z_$]*(?:\[(?:"(?:\\\.|[^"\\\])*"|\'(?:\\\.|[^\'\\\])*\'|\d+)\])*?$/';
 
-    private $reservedKeywords = array(
+    private static $reservedKeywords = array(
         'break',
         'do',
         'instanceof',
@@ -62,14 +62,14 @@ class JsonpCallbackValidator
      * @param  string  $callback
      * @return boolean
      */
-    public function validate($callback)
+    public static function validate($callback)
     {
         foreach (explode('.', $callback) as $identifier) {
-            if (!preg_match($this->regexp, $identifier)) {
+            if (!preg_match(self::$regexp, $identifier)) {
                 return false;
             }
 
-            if (in_array($identifier, $this->reservedKeywords)) {
+            if (in_array($identifier, self::$reservedKeywords)) {
                 return false;
             }
         }
diff --git a/tests/JsonpCallbackValidatorTest.php b/tests/JsonpCallbackValidatorTest.php
index 29df3aa..27322cc 100644
--- a/tests/JsonpCallbackValidatorTest.php
+++ b/tests/JsonpCallbackValidatorTest.php
@@ -69,4 +69,9 @@ public static function dataProviderForTestValidate()
             array("array_of_functions['\'']",     self::IS_VALID),
         );
     }
+
+    public function testCallStatically()
+    {
+        $this->assertTrue(\JsonpCallbackValidator::validate('foo'));
+    }
 }