diff --git a/README.md b/README.md
index 9850d3c..78de291 100644
--- a/README.md
+++ b/README.md
@@ -10,8 +10,7 @@
 * [ ] R2 - Partially supported
   - [x] Head
   - [x] Get
-  - [x] Put (load all bytes to memory)
-  - [ ] Put (stream)
+  - [x] Put
   - [x] Delete
   - [x] List
   - [ ] Options for R2 methods
diff --git a/r2bucket.go b/r2bucket.go
index 1fbc6b5..be2be52 100644
--- a/r2bucket.go
+++ b/r2bucket.go
@@ -103,12 +103,7 @@ func (opts *R2PutOptions) toJS() js.Value {
 // * Body field of *R2Object is always nil for Put call.
 // * if a network error happens, returns error.
 func (r *r2Bucket) Put(key string, value io.ReadCloser, opts *R2PutOptions) (*R2Object, error) {
-	/* TODO: implement this in FixedLengthStream: https://developers.cloudflare.com/workers/runtime-apis/streams/transformstream/#fixedlengthstream
-	body := convertReaderToReadableStream(value)
-	streams := fixedLengthStreamClass.New(contentLength)
-	rs := streams.Get("readable")
-	body.Call("pipeTo", streams.Get("writable"))
-	*/
+	// fetch body cannot be ReadableStream. see: https://github.com/whatwg/fetch/issues/1438
 	b, err := io.ReadAll(value)
 	if err != nil {
 		return nil, err