diff --git a/app/home/service/BaseHomeService.php b/app/home/service/BaseHomeService.php
index 3bf923fa..084986c6 100644
--- a/app/home/service/BaseHomeService.php
+++ b/app/home/service/BaseHomeService.php
@@ -75,8 +75,7 @@ class BaseHomeService
     public function getSmsContent(int $type = 1): array
     {
         $code = random_int(1000, 9999);
-        $subject = "【Acm】あなたの認証コード[$code],有効10分以内";
-        // $subject = "your code is [$code], valid for 5 minutes";
+        $subject = "【モントレー・ジャパン】認証コード：[$code]（有効期限30分）";
         return ['subject' => $subject, 'code' => $code];
     }