diff --git a/internal/types/types.go b/internal/types/types.go
index 3d466661e8d41f871dcc5707be1ca2e2153fa852..03b1becb4e271a4cefc22ca42c497f139910fd99 100644
--- a/internal/types/types.go
+++ b/internal/types/types.go
@@ -384,6 +384,8 @@ type RootCoordComponent interface {
 
 	// SetDataCoord set DataCoord for RootCoord
 	SetDataCoord(context.Context, DataCoord) error
+
+	// SetIndexCoord set IndexCoord for RootCoord
 	SetIndexCoord(IndexCoord) error
 	SetQueryCoord(QueryCoord) error
 	SetNewProxyClient(func(sess *sessionutil.Session) (Proxy, error))