diff --git a/pkg/blobserver/protocol/protocol.go b/pkg/blobserver/protocol/protocol.go
index 2769ef2f1..59889b70a 100644
--- a/pkg/blobserver/protocol/protocol.go
+++ b/pkg/blobserver/protocol/protocol.go
@@ -51,7 +51,7 @@ func (p *StatResponse) MarshalJSON() ([]byte, error) {
 // See doc/protocol/blob-upload-protocol.txt.
 type UploadResponse struct {
 	Received  []*RefAndSize `json:"received"`
-	ErrorText string        `json:"errortext,omitempty"`
+	ErrorText string        `json:"errorText,omitempty"`
 }
 
 func (p *UploadResponse) MarshalJSON() ([]byte, error) {
diff --git a/pkg/client/upload.go b/pkg/client/upload.go
index ccfe902c6..6fd9d53bb 100644
--- a/pkg/client/upload.go
+++ b/pkg/client/upload.go
@@ -488,6 +488,7 @@ func (c *Client) Upload(h *UploadHandle) (*PutResult, error) {
 		}
 	}
 
+	// TODO(mpl): use struct type instead of map for res.
 	ures, err := c.responseJSONMap("upload", resp)
 	if err != nil {
 		return errorf("json parse from upload error: %v", err)