diff --git a/qcloud_cos/cos_client.py b/qcloud_cos/cos_client.py
index 3d0e4a68..99bca66d 100644
--- a/qcloud_cos/cos_client.py
+++ b/qcloud_cos/cos_client.py
@@ -721,7 +721,7 @@ def complete_multipart_upload(self, Bucket, Key, UploadId, MultipartUpload={}, *
         params = {'uploadId': UploadId}
         params = format_values(params)
         url = self._conf.uri(bucket=Bucket, path=Key)
-        logger.info("create multipart upload, url=:{url} ,headers=:{headers}".format(
+        logger.info("complete multipart upload, url=:{url} ,headers=:{headers}".format(
             url=url,
             headers=headers))
         rt = self.send_request(
diff --git a/qcloud_cos/version.py b/qcloud_cos/version.py
index 5517c376..8821e6e3 100644
--- a/qcloud_cos/version.py
+++ b/qcloud_cos/version.py
@@ -1,2 +1,2 @@
 
-__version__ = '5.1.6.3'
+__version__ = '5.1.6.4'