diff --git a/weed/filer2/reader_at.go b/weed/filer2/reader_at.go
index 52460380c..2894f4a4b 100644
--- a/weed/filer2/reader_at.go
+++ b/weed/filer2/reader_at.go
@@ -110,7 +110,7 @@ func (c *ChunkReadAt) doReadAt(p []byte, offset int64) (n int, err error) {
 
 	if remaining > 0 && c.fileSize > startOffset {
 		delta := int(min(remaining, c.fileSize - startOffset))
-		glog.V(4).Infof("zero2 [%d,%d)", n, n+delta)
+		glog.V(4).Infof("zero2 [%d,%d) of file size %d bytes", startOffset, startOffset+int64(delta), c.fileSize)
 		n += delta
 	}