diff --git a/helper/string.utils.php b/helper/string.utils.php
index 5828bd1..5abd21e 100644
--- a/helper/string.utils.php
+++ b/helper/string.utils.php
@@ -1,7 +1,8 @@
 <?php
 /**
  * @file string.utils.php
- * @date 2018-05-27
+ * @created_on 2018-05-27
+ * @updated_on 2020-01-25
  * @author Go Namhyeon <gnh1201@gmail.com>
  * @brief String utility helper
  */