diff --git a/src/Helper/StringGenerationHelper.php b/src/Helper/StringGenerationHelper.php
index bf0d1c8..2b7a9cb 100644
--- a/src/Helper/StringGenerationHelper.php
+++ b/src/Helper/StringGenerationHelper.php
@@ -10,11 +10,11 @@
     /**
      * Generate an random string
      *
-     * @param string $base Charset to generate the random string
+     * @param array $base Charset to generate the random string
      * @param int $length Length of the random string
      * @return string
      */
-    public static function generateString(string $base, int $length): string
+    public static function generateString(array $base, int $length): string
     {
         $output = '';
         for ($index = 0; $index < $length; $index ++) {