diff --git a/samples/SKIT.FlurlHttpClient.Wechat.TenpayV3.Sample_Net6/Services/BackgroundServices/TenpayCertificateRefreshingBackgroundService.cs b/samples/SKIT.FlurlHttpClient.Wechat.TenpayV3.Sample_Net6/Services/BackgroundServices/TenpayCertificateRefreshingBackgroundService.cs
index f73137b8..151c93f9 100644
--- a/samples/SKIT.FlurlHttpClient.Wechat.TenpayV3.Sample_Net6/Services/BackgroundServices/TenpayCertificateRefreshingBackgroundService.cs
+++ b/samples/SKIT.FlurlHttpClient.Wechat.TenpayV3.Sample_Net6/Services/BackgroundServices/TenpayCertificateRefreshingBackgroundService.cs
@@ -28,6 +28,9 @@ namespace SKIT.FlurlHttpClient.Wechat.TenpayV3.Sample.Services.BackgroundService
 
         protected override async Task ExecuteAsync(CancellationToken stoppingToken)
         {
+            // NOTICE:
+            //   2024-10-01 后微信支付新增了基于微信支付公钥的验证身份方式，
+            //   如果你已切换至使用平台公钥，则不再需要下载平台证书，可忽略此定时任务。
             while (!stoppingToken.IsCancellationRequested)
             {
                 foreach (var tenpayMerchantOptions in _tenpayOptions.Merchants)
diff --git a/samples/SKIT.FlurlHttpClient.Wechat.TenpayV3.Sample_NetFramework47/Services/BackgroundJobs/TenpayCertificateRefreshingBackgroundJob.cs b/samples/SKIT.FlurlHttpClient.Wechat.TenpayV3.Sample_NetFramework47/Services/BackgroundJobs/TenpayCertificateRefreshingBackgroundJob.cs
index f405e408..cc7dec40 100644
--- a/samples/SKIT.FlurlHttpClient.Wechat.TenpayV3.Sample_NetFramework47/Services/BackgroundJobs/TenpayCertificateRefreshingBackgroundJob.cs
+++ b/samples/SKIT.FlurlHttpClient.Wechat.TenpayV3.Sample_NetFramework47/Services/BackgroundJobs/TenpayCertificateRefreshingBackgroundJob.cs
@@ -12,6 +12,9 @@ namespace SKIT.FlurlHttpClient.Wechat.TenpayV3.Sample.Services.BackgroundJobs
 
         public async Task ExecuteAsync()
         {
+            // NOTICE:
+            //   2024-10-01 后微信支付新增了基于微信支付公钥的验证身份方式，
+            //   如果你已切换至使用平台公钥，则不再需要下载平台证书，可忽略此定时任务。
             foreach (var tenpayMerchantOptions in Options.TenpayOptions.Instance.Value.Merchants)
             {
                 try