diff --git a/scan.php b/scan.php
index f2812b3..6d0a46f 100644
--- a/scan.php
+++ b/scan.php
@@ -26,7 +26,7 @@ class MalwareScanner
     private $ANSI_OFF = "\033[0m";
 
     private $dir = '';
-    private $extension = '.php';
+    private $extension = array ('.php');
     private $flagBase64 = false;
     private $flagChecksum = false;
     private $flagComments = false;
@@ -188,7 +188,7 @@ class MalwareScanner
             )
         );
 
-        //Help Option should be first 
+        //Help Option should be first
         if (isset($options['help']) || isset($options['h'])) {
             $this->showHelp();
             exit;
@@ -199,11 +199,17 @@ class MalwareScanner
             $this->dir = isset($options['directory']) ? $options['directory'] : $options['d'];
         }
         if (isset($options['extension']) || isset($options['e'])) {
-            $ext = isset($options['extension']) ? $options['extension'] : $options['e'];
-            if ($ext[0] != '.') {
-                $ext = '.' . $ext;
+            $a = isset($options['extension']) ? $options['extension'] : $options['e'];
+            if (!is_array($a)) {
+                $a = array($a);
+            }
+            $this->extension = array();
+            foreach ($a as $ext) {
+                if ($ext[0] != '.') {
+                    $ext = '.' . $ext;
+                }
+                $this->extension[] = strtolower($ext);
             }
-            $this->extension = strtolower($ext);
         }
         if (isset($options['ignore']) || isset($options['i'])) {
             $tmp = isset($options['ignore']) ? $options['ignore'] : $options['i'];
@@ -371,7 +377,7 @@ class MalwareScanner
                 $this->process($dir . $file . '/');
             } elseif (is_file($dir . $file)) {
                 $ext = strtolower(substr($file, strrpos($file, '.')));
-                if ($ext == $this->extension) {
+                if (in_array($ext, $this->extension)) {
                     $this->scan($dir . $file);
                 }
             }
@@ -507,7 +513,7 @@ class MalwareScanner
         echo 'Usage: php scan.php -d <directory>' . PHP_EOL;
         echo '    -h                   --help             Show this help message' . PHP_EOL;
         echo '    -d <directory>       --directory        Directory for searching' . PHP_EOL;
-        echo '    -e <file extension>  --extension        File Extension to Scan' . PHP_EOL;
+        echo '    -e <file extension>  --extension        File Extension to Scan, can be used multiple times' . PHP_EOL;
         echo '    -i <directory|file>  --ignore           Directory of file to ignore' . PHP_EOL;
         echo '    -a                   --all-output       Enables --checksum,--comment,--pattern,--time' . PHP_EOL;
         echo '    -b                   --base64           Scan for base64 encoded PHP keywords' . PHP_EOL;