diff --git a/proto/kvrpcpb.proto b/proto/kvrpcpb.proto
index ee39c11af..2b490ca57 100644
--- a/proto/kvrpcpb.proto
+++ b/proto/kvrpcpb.proto
@@ -1531,7 +1531,7 @@ message TiFlashSystemTableResponse {
     bytes data = 1 [(gogoproto.customtype) = "github.com/pingcap/kvproto/pkg/sharedbytes.SharedBytes", (gogoproto.nullable) = false];
 }
 
-// Flush is introduced from the large transaction v2 protocol. 
+// Flush is introduced from the pipelined DML protocol. 
 // A Flush request writes some keys and values to TiKV, storing in LOCK and DEFAULT CF, just like a Prewrite request.
 message FlushRequest {
     Context context = 1;
@@ -1547,7 +1547,7 @@ message FlushResponse {
     ExecDetailsV2 exec_details_v2 = 3;
 }
 
-// BufferBatchGet is introduced from the large transaction v2 protocol.
+// BufferBatchGet is introduced from the pipelined DML protocol.
 // It is similar to a BatchGet request, except that it can only read the data that has been flushed by itself.
 message BufferBatchGetRequest {
     Context context = 1;