diff --git a/internal/distributed/indexcoord/client/client.go b/internal/distributed/indexcoord/client/client.go
index 37a64f8f888075da463b30c9a80af2e093cb6815..0a6017e3d308f4991d79abf93a01ba0b3d361ae4 100644
--- a/internal/distributed/indexcoord/client/client.go
+++ b/internal/distributed/indexcoord/client/client.go
@@ -36,6 +36,7 @@ import (
 	"github.com/milvus-io/milvus/internal/proto/milvuspb"
 )
 
+// Base is a base class abstracted from components.
 type Base interface {
 	types.IndexCoord