diff --git a/config/config.yaml b/config/config.yaml
index 87c14a60f..3f848dc0b 100644
--- a/config/config.yaml
+++ b/config/config.yaml
@@ -127,7 +127,7 @@ api:
 # apiURL is the address of the api, the access address of the app, use s3 must be configured
 # minio.endpoint can be configured as an intranet address,
 # minio.signEndpoint is minio public network address
-# minio.thumbnailApi is the address of the thumbnail service, the access address of the app
+# minio.thumbnailApi is the address of the thumbnail service, the access address of the app, https://github.com/OpenIMSDK/minio-ext
 # minio.thumbnailUseSignEndpoint whether the url parameter for generating thumbnails uses a signed address, the default is fine
 object:
   enable: "minio"