diff --git a/src/Appwrite/Database/Adapter.php b/src/Appwrite/Database/Adapter.php
index 0bfac77e1..bb650e844 100644
--- a/src/Appwrite/Database/Adapter.php
+++ b/src/Appwrite/Database/Adapter.php
@@ -91,7 +91,7 @@ abstract class Adapter
     /**
      * Delete Unique Key.
      *
-     * @param String $key
+     * @param string $key
      *
      * @return array
      */
@@ -100,7 +100,7 @@ abstract class Adapter
     /**
      * Add Unique Key.
      *
-     * @param String $key
+     * @param string $key
      *
      * @return array
      */
diff --git a/src/Appwrite/Database/Adapter/MySQL.php b/src/Appwrite/Database/Adapter/MySQL.php
index d179291ed..6858e9342 100644
--- a/src/Appwrite/Database/Adapter/MySQL.php
+++ b/src/Appwrite/Database/Adapter/MySQL.php
@@ -360,7 +360,7 @@ class MySQL extends Adapter
     /**
      * Delete Unique Key.
      *
-     * @param String $key
+     * @param string $key
      *
      * @return array
      *
@@ -380,13 +380,12 @@ class MySQL extends Adapter
     /**
      * Add Unique Key.
      *
-     * @param String $key
+     * @param string $key
      *
      * @return array
      *
      * @throws Exception
      */
-
     public function addUniqueKey($key)
     {
         $st = $this->getPDO()->prepare('INSERT INTO `'.$this->getNamespace().'.database.unique`