diff --git a/be/database/migrations/2023_02_07_083923_add_subtask_id_to_attachments.php b/be/database/migrations/2023_02_07_083923_add_subtask_id_to_attachments.php
new file mode 100644
index 0000000..c3e7b2f
--- /dev/null
+++ b/be/database/migrations/2023_02_07_083923_add_subtask_id_to_attachments.php
@@ -0,0 +1,33 @@
+<?php
+
+use Illuminate\Database\Migrations\Migration;
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Support\Facades\Schema;
+
+return new class extends Migration
+{
+    /**
+     * Run the migrations.
+     *
+     * @return void
+     */
+    public function up()
+    {
+        Schema::table('attachments', function (Blueprint $table) {
+            $table->foreignIdFor( \App\Models\SubTask::class)->nullable()->after('master_task_id');
+            $table->bigInteger( 'master_task_id')->nullable()->change();
+        });
+    }
+
+    /**
+     * Reverse the migrations.
+     *
+     * @return void
+     */
+    public function down()
+    {
+        Schema::table('master_tasks', function (Blueprint $table) {
+            //
+        });
+    }
+};