diff --git a/weed/storage/needle/needle_parse_upload.go b/weed/storage/needle/needle_parse_upload.go
index d97ca3101..4d244046e 100644
--- a/weed/storage/needle/needle_parse_upload.go
+++ b/weed/storage/needle/needle_parse_upload.go
@@ -90,7 +90,7 @@ func ParseUpload(r *http.Request, sizeLimit int64) (pu *ParsedUpload, e error) {
 	pu.ContentMd5 = base64.StdEncoding.EncodeToString(h.Sum(nil))
 	if expectedChecksum := r.Header.Get("Content-MD5"); expectedChecksum != "" {
 		if expectedChecksum != pu.ContentMd5 {
-			e = fmt.Errorf("Content-MD5 did not match md5 of file data [%s] != [%s]", expectedChecksum, pu.ContentMd5)
+			e = fmt.Errorf("Content-MD5 did not match md5 of file data expected [%s] received [%s] size %d", expectedChecksum, pu.ContentMd5, len(pu.UncompressedData))
 			return
 		}
 	}