diff --git a/weed/storage/store_ec.go b/weed/storage/store_ec.go
index e423e7dca..2b0df439c 100644
--- a/weed/storage/store_ec.go
+++ b/weed/storage/store_ec.go
@@ -180,7 +180,7 @@ func (s *Store) readOneEcShardInterval(needleId types.NeedleId, ecVolume *erasur
 	data = make([]byte, interval.Size)
 	if shard, found := ecVolume.FindEcVolumeShard(shardId); found {
 		if _, err = shard.ReadAt(data, actualOffset); err != nil {
-			glog.V(0).Infof("read local ec shard %d.%d: %v", ecVolume.VolumeId, shardId, err)
+			glog.V(0).Infof("read local ec shard %d.%d offset %d: %v", ecVolume.VolumeId, shardId, actualOffset, err)
 			return
 		}
 	} else {