diff --git a/internal/transport/transport.go b/internal/transport/transport.go
index 7f82cbb080df..0600e5042da9 100644
--- a/internal/transport/transport.go
+++ b/internal/transport/transport.go
@@ -578,8 +578,11 @@ type ClientTransport interface {
 	// is called only once.
 	Close() error
 
-	// GracefulClose starts to tear down the transport. It stops accepting
-	// new RPCs and wait the completion of the pending RPCs.
+	// GracefulClose starts to tear down the transport: the transport will stop
+	// accepting new RPCs and NewStream will return error. Once all streams are
+	// finished, the transport will close.
+	//
+	// It does not block.
 	GracefulClose() error
 
 	// Write sends the data for the given stream. A nil stream indicates