diff --git a/chat.php b/chat.php
index 2bc6225..d0f97fc 100644
--- a/chat.php
+++ b/chat.php
@@ -1,12 +1,12 @@
 <?php
 
-require_once './modules/common.mod.php';
+require_once './modules/chat.mod.php';
 
 
-$db = new Chat;
+$chat = new Chat;
 
 $user_id = $_POST['id'];
 $chat_message = $_POST['text'];
 
-$db -> send_chat ($user_id, $chat_message);
+$chat -> send ($user_id, $chat_message);
 
diff --git a/modules/chat.mod.php b/modules/chat.mod.php
index 2e95da4..ff0520c 100644
--- a/modules/chat.mod.php
+++ b/modules/chat.mod.php
@@ -3,10 +3,11 @@
 class
 Chat
 {
-  var $db;
+  private $db;
 
   function
-  __construct ()
+  __construct ():
+  void
   {
     $config = include (__DIR__ . '/config.php');
 
@@ -28,7 +29,7 @@ Chat
     $sql = "
         INSERT INTO
           chats (
-            id,
+            user_id,
             text)
           VALUES
             (