diff --git a/lib/educoder/sms.rb b/lib/educoder/sms.rb
index cadce7465..7fa1c0edb 100644
--- a/lib/educoder/sms.rb
+++ b/lib/educoder/sms.rb
@@ -36,7 +36,7 @@ module  Educoder
       params['mobile'] = mobile
       params['text'] = ""
       if send_type.nil?
-        params['text'] = "【Edu实训】" + code + "（手机验证码）。如非本人操作，请忽略。"
+        params['text'] = "【Edu实训】" + code + "（手机验证码），有效期为10分钟。如非本人操作，请忽略。"
       elsif send_type == 'competition_start'
         params['text'] = "【Edu实训】亲爱的#{user_name}，你参与的#{name}将于#{result}开始，请及时参赛"
         Rails.logger.info "#{params['text']}"