diff --git a/migrations/m170831_094035_comment_add_foreogn_key.php b/migrations/m170831_094035_comment_add_foreogn_key.php
new file mode 100644
index 0000000..f733911
--- /dev/null
+++ b/migrations/m170831_094035_comment_add_foreogn_key.php
@@ -0,0 +1,37 @@
+<?php
+
+use yii\db\Migration;
+
+class m170831_094035_comment_add_foreogn_key extends Migration
+{
+    public function safeUp()
+    {
+            $this->addForeignKey('comment_customer',
+                                'artbox_comment',
+                                'customer_id',
+                                'customer',
+                                'id',
+                                'CASCADE',
+                                'CASCADE');
+    }
+
+    public function safeDown()
+    {
+        $this->dropForeignKey('comment_customer', 'artbox_comment');
+    }
+
+    /*
+    // Use up()/down() to run migration code without a transaction.
+    public function up()
+    {
+
+    }
+
+    public function down()
+    {
+        echo "m170831_094035_comment_add_foreogn_key cannot be reverted.\n";
+
+        return false;
+    }
+    */
+}
--
libgit2 0.21.4