diff --git a/connection.go b/connection.go
index a2f2080..e1b07c4 100644
--- a/connection.go
+++ b/connection.go
@@ -42,6 +42,9 @@ type Trans interface {
 		
 	// Send sends a message.
 	Send(method uint16, data []byte) error
+	// SendWriter sends data written to an [io.Writer]. Any writer
+	// previously opened through this function will be discarded.
+	SendWriter(method uint16) (io.Writer, error)
 	// Receive receives a message.
 	Receive() (method uint16, data []byte, err error)
 	// ReceiveReader receives a message as an [io.Reader]. Any reader