diff --git a/README.md b/README.md
index daf9db888..7ad47e036 100644
--- a/README.md
+++ b/README.md
@@ -323,9 +323,7 @@ options:
 - accessKeySecret {String} access secret you create
 - [stsToken] {String} used by temporary authorization, detail [see](https://www.alibabacloud.com/help/doc-detail/32077.htm)
 - [refreshSTSToken] {Function} used by auto set `stsToken`、`accessKeyId`、`accessKeySecret` when sts info expires. return value must be object contains `stsToken`、`accessKeyId`、`accessKeySecret`
-- [refreshSTSTokenInterval] {number} use time (ms) of refresh STSToken interval it should be
-  less than sts info expire interval, default is 300000ms(5min)
-  when sts info expires. return value must be object contains `stsToken`、`accessKeyId`、`accessKeySecret`
+- [refreshSTSTokenInterval] {number} use time (ms) of refresh STSToken interval it should be less than sts info expire interval, default is 300000ms(5min)
 - [bucket] {String} the default bucket you want to access
   If you don't have any bucket, please use `putBucket()` create one first.
 - [endpoint] {String} oss region domain. It takes priority over `region`. Set as extranet domain name, intranet domain name, accelerated domain name, etc. according to different needs. please see [endpoints](https://www.alibabacloud.com/help/doc-detail/31837.htm)