diff --git a/docs/developer_guides/chap06_root_coordinator.md b/docs/developer_guides/chap06_root_coordinator.md
index f6c7a4c736..0edb1f1e43 100644
--- a/docs/developer_guides/chap06_root_coordinator.md
+++ b/docs/developer_guides/chap06_root_coordinator.md
@@ -464,7 +464,7 @@ type Core struct {
 	// if RootCoord create segment, DataCoord will put segment msg into this channel
 	DataCoordSegmentChan <-chan *ms.MsgPack
 
-	// if segment flush completed, data node would put segment msg into this channel
+	// if segment flush completed, DataNode would put segment msg into this channel
 	DataNodeFlushedSegmentChan <-chan *ms.MsgPack
 
 	//get binlog file path from data service,