diff --git a/src/CGSelect.php b/src/CGSelect.php
index 43bbae6..0efa8a2 100644
--- a/src/CGSelect.php
+++ b/src/CGSelect.php
@@ -11,11 +11,19 @@ class CGSelect
         $this->driver = new CGSelectDriver($selector, $options);
     }
 
-    public function getJS(){
+    /**
+     * @return string
+     */
+    public function getJS(): string
+    {
         return $this->driver->getJS();
     }
 
-    public static function renderCDN($version = 'latest')
+    /**
+     * @param $version
+     * @return void
+     */
+    public static function renderCDN($version = 'latest'): void
     {
         CGSelectDriver::renderCDN($version);
     }