diff --git a/client/tablet.go b/client/tablet.go
index 1a41c87..7d8e253 100644
--- a/client/tablet.go
+++ b/client/tablet.go
@@ -314,6 +314,7 @@ func (t *Tablet) getValuesBytes() ([]byte, error) {
 			columnHasNil := bitMap != nil && !bitMap.IsAllUnmarked()
 			binary.Write(buff, binary.BigEndian, columnHasNil)
 			if columnHasNil {
+				// Need to maintain consistency with the calculation method on the IoTDB side.
 				binary.Write(buff, binary.BigEndian, bitMap.GetBits()[0:t.RowSize/8+1])
 			}
 		}