diff --git a/internal/rootcoord/root_coord.go b/internal/rootcoord/root_coord.go
index a99fe96975..6d8cba89b1 100644
--- a/internal/rootcoord/root_coord.go
+++ b/internal/rootcoord/root_coord.go
@@ -937,6 +937,7 @@ func (c *Core) Register() error {
 	return nil
 }
 
+// SetEtcdClient sets the etcdCli of Core
 func (c *Core) SetEtcdClient(etcdClient *clientv3.Client) {
 	c.etcdCli = etcdClient
 }