diff --git a/docs/README.md b/docs/README.md
index 8003237b..801792e1 100644
--- a/docs/README.md
+++ b/docs/README.md
@@ -253,10 +253,7 @@ char* upload(Qiniu_Client* client, char* uptoken, const char* key, const char* l
 {
 	Qiniu_Error err;
 	Qiniu_Io_PutRet putRet;
-	Qiniu_Io_PutExtra extra;
-	Qiniu_Zero(extra);
-	extra.bucket = bucket;
-	err = Qiniu_Io_PutFile(client, &putRet, uptoken, key, localFile, &extra);
+	err = Qiniu_Io_PutFile(client, &putRet, uptoken, key, localFile, NULL);
 	if (err.code != 200) {
 		debug(client, err);
 		return NULL;
@@ -271,10 +268,7 @@ char* upload(Qiniu_Client* client, char* uptoken, const char* key, const char* l
 int simple_upload(Qiniu_Client* client, char* uptoken, const char* key, const char* localFile)
 {
 	Qiniu_Error err;
-	Qiniu_Io_PutExtra extra;
-	Qiniu_Zero(extra);
-	extra.bucket = bucket;
-	err = Qiniu_Io_PutFile(client, NULL, uptoken, key, localFile, &extra);
+	err = Qiniu_Io_PutFile(client, NULL, uptoken, key, localFile, NULL);
 	return err.code;
 }
 ```
diff --git a/docs/gist/client.c b/docs/gist/client.c
index 2de4f019..8e35d7ae 100644
--- a/docs/gist/client.c
+++ b/docs/gist/client.c
@@ -17,10 +17,7 @@ char* upload(Qiniu_Client* client, char* uptoken, const char* key, const char* l
 {
 	Qiniu_Error err;
 	Qiniu_Io_PutRet putRet;
-	Qiniu_Io_PutExtra extra;
-	Qiniu_Zero(extra);
-	extra.bucket = bucket;
-	err = Qiniu_Io_PutFile(client, &putRet, uptoken, key, localFile, &extra);
+	err = Qiniu_Io_PutFile(client, &putRet, uptoken, key, localFile, NULL);
 	if (err.code != 200) {
 		debug(client, err);
 		return NULL;
@@ -33,10 +30,7 @@ char* upload(Qiniu_Client* client, char* uptoken, const char* key, const char* l
 int simple_upload(Qiniu_Client* client, char* uptoken, const char* key, const char* localFile)
 {
 	Qiniu_Error err;
-	Qiniu_Io_PutExtra extra;
-	Qiniu_Zero(extra);
-	extra.bucket = bucket;
-	err = Qiniu_Io_PutFile(client, NULL, uptoken, key, localFile, &extra);
+	err = Qiniu_Io_PutFile(client, NULL, uptoken, key, localFile, NULL);
 	return err.code;
 }
 /* @endgist */