diff --git a/internal/rootcoord/root_coord.go b/internal/rootcoord/root_coord.go
index ab1de13f48..2ef9d27104 100644
--- a/internal/rootcoord/root_coord.go
+++ b/internal/rootcoord/root_coord.go
@@ -59,7 +59,7 @@ import (
 
 // ------------------ struct -----------------------
 
-// DdOperation used to save ddMsg into ETCD
+// DdOperation used to save ddMsg into etcd
 type DdOperation struct {
 	Body []byte `json:"body"`
 	Type string `json:"type"`