diff --git a/app/Customize/Webhook/GithubRequestParser.php b/app/Customize/Webhook/GithubRequestParser.php
index 68a1172372..2c0c446da6 100644
--- a/app/Customize/Webhook/GithubRequestParser.php
+++ b/app/Customize/Webhook/GithubRequestParser.php
@@ -81,6 +81,7 @@ protected function validateHeaders(HeaderBag $headers): void
 
     protected function validatePayload(InputBag $payload): void
     {
+        // プルリクがクローズドされていない場合はエラー
         if ($payload->has('action') && 'closed' !== $payload->get('action')) {
             throw new RejectWebhookException(406, 'Pull Request is not closed.');
         }