diff --git a/tidb-cloud/serverless-export.md b/tidb-cloud/serverless-export.md
index a54bd6120b192..d6e00690a563a 100644
--- a/tidb-cloud/serverless-export.md
+++ b/tidb-cloud/serverless-export.md
@@ -23,7 +23,7 @@ You can export data to local storage or [Amazon S3](https://aws.amazon.com/s3/).
 
 > **Note:**
 >
-> If the size of the data to be exported is large, it is recommended that you export it to Amazon S3.
+> If the size of the data to be exported is large(more than 100 GiB), it is recommended that you export it to Amazon S3.
 
 **Local storage**
 
@@ -35,7 +35,7 @@ Exporting data to local storage has the following limitations:
 
 **Amazon S3**
 
-To export data to Amazon S3, you need to provide an [access key](https://docs.aws.amazon.com/IAM/latest/UserGuide/id_credentials_access-keys.html) for your S3 bucket and make sure the access key has the necessary permissions for your S3 bucket. It is recommended that you create a new bucket with full S3 access.
+To export data to Amazon S3, you need to provide an [access key](https://docs.aws.amazon.com/IAM/latest/UserGuide/id_credentials_access-keys.html) for your S3 bucket. Please make sure the access key has the read and write access for your S3 bucket, including at least these permissions: `s3:PutObject`, and `s3:ListBucket`.
 
 ### Data filtering