diff --git a/message/matrix.go b/message/matrix.go
index 04b6d7a..ef26306 100644
--- a/message/matrix.go
+++ b/message/matrix.go
@@ -87,6 +87,7 @@ func (m *Matrix) Receive() ([]Message, error) {
 	logtr.Debugf("%s => {Start:%s End:%v};; %v, (%d)", m.Continuation(), result.Start, result.End, err, len(result.Chunk))
 	m.continuation = result.End
 	for _, event := range result.Chunk {
+		logtr.Verbosef("matrix event: %+v", event)
 		if _, ok := matrixIDs[event.Sender]; !ok {
 			continue
 		}
@@ -124,19 +125,65 @@ func (m *Matrix) Receive() ([]Message, error) {
 	return messages, nil
 }
 
-func (m Matrix) Send(text string) error {
+func (m Matrix) Update(id, text string) error {
 	if m.mock {
-		logtr.Infof("matrix.Send(%s)", text)
+		logtr.Infof("matrix.Update(%s)", text)
 		return nil
 	}
 	c, err := m.getclient()
 	if err != nil {
 		return err
 	}
-	_, err = c.SendText(m.room, text)
+	type MRelatesTo struct {
+		EventID string `json:"event_id"`
+		RelType string `json:"rel_type"`
+	}
+	type NewContent struct {
+		Body    string `json:"body"`
+		MsgType string `json:"msgtype"`
+	}
+	type RelatesToRoomMessage struct {
+		Body        string     `json:"body"`
+		MsgType     string     `json:"msgtype"`
+		MRelatesTo  MRelatesTo `json:"m.relates_to"`
+		MNewContent NewContent `json:"m.new_content"`
+	}
+	_, err = c.SendMessageEvent(m.room, "m.room.message", RelatesToRoomMessage{
+		Body:    "",
+		MsgType: "m.text",
+		MNewContent: NewContent{
+			Body:    text,
+			MsgType: "m.text",
+		},
+		MRelatesTo: MRelatesTo{
+			EventID: id,
+			RelType: "m.replace",
+		},
+	})
 	return err
 }
 
+func (m Matrix) Send(text string) error {
+	_, err := m.SendTracked(text)
+	return err
+}
+
+func (m Matrix) SendTracked(text string) (string, error) {
+	if m.mock {
+		logtr.Infof("matrix.SendTracked(%s)", text)
+		return "", nil
+	}
+	c, err := m.getclient()
+	if err != nil {
+		return "", err
+	}
+	resp, err := c.SendText(m.room, text)
+	if err != nil {
+		return "", err
+	}
+	return resp.EventID, nil
+}
+
 func (m Matrix) SendImage(uri string) error {
 	if m.mock {
 		logtr.Infof("matrix.SendImage(%s)", uri)
diff --git a/message/matrix_test.go b/message/matrix_test.go
index 960a94d..f6818dc 100644
--- a/message/matrix_test.go
+++ b/message/matrix_test.go
@@ -1,57 +1,63 @@
 package message
 
 import (
-	"encoding/json"
 	"io/ioutil"
 	"local/truckstop/config"
 	"os"
+	"path"
 	"testing"
+
+	"github.com/google/uuid"
 )
 
 func TestMatrixSend(t *testing.T) {
-	if len(os.Getenv("INTEGRATION")) == 0 {
-		t.Skip("$INTEGRATION not set")
-	}
-	var c config.Config
-	b, err := ioutil.ReadFile("../config.json")
-	if err != nil {
-		t.Fatal(err)
-	}
-	if err := json.Unmarshal(b, &c); err != nil {
-		t.Fatal(err)
-	}
-	var sender Sender = &Matrix{
-		homeserver: c.Message.Matrix.Homeserver,
-		username:   c.Message.Matrix.Username,
-		token:      c.Message.Matrix.Token,
-		room:       c.Message.Matrix.Room,
-	}
+	sender := testMatrix(t)
 	if err := sender.Send("hello world from unittest"); err != nil {
 		t.Fatal(err)
 	}
 }
 
-func TestMatrixReceive(t *testing.T) {
-	if len(os.Getenv("INTEGRATION")) == 0 {
-		t.Skip("$INTEGRATION not set")
-	}
-	var c config.Config
-	b, err := ioutil.ReadFile("../config.json")
+func TestMatrixUpdate(t *testing.T) {
+	// 19:32:34: VER: matrix event: {StateKey:<nil> Sender:@bot:m.bltrucks.top Type:m.room.message Timestamp:1642471594729 ID:$n0ln9TFZrko_cBNFXeh8YyICZ3fFm17Jhz3bmZcqig4 RoomID:!OYZqtInrBCn1cyz90D:m.bltrucks.top Redacts: Unsigned:map[transaction_id:go1642471594571852423] Content:map[body:hello world from unittest format: formatted_body: msgtype:m.text] PrevContent:map[]}
+	// func (m Matrix) Update(id, text string) error {
+	m := testMatrix(t)
+	uid := uuid.New().String()[:3]
+	id, err := m.SendTracked("hello, heheheh from test matrix update " + uid)
 	if err != nil {
 		t.Fatal(err)
 	}
-	if err := json.Unmarshal(b, &c); err != nil {
+	err = m.Update(id, "heheheh i updated from test matrix update "+uid)
+	if err != nil {
 		t.Fatal(err)
 	}
-	var sender Sender = &Matrix{
-		homeserver: c.Message.Matrix.Homeserver,
-		username:   c.Message.Matrix.Username,
-		token:      c.Message.Matrix.Token,
-		room:       c.Message.Matrix.Room,
-	}
+	m.Receive()
+}
+
+func TestMatrixReceive(t *testing.T) {
+	sender := testMatrix(t)
 	if msgs, err := sender.Receive(); err != nil {
 		t.Fatal(err)
 	} else {
 		t.Logf("%+v", msgs)
 	}
 }
+
+func testMatrix(t *testing.T) Matrix {
+	if len(os.Getenv("INTEGRATION")) == 0 {
+		t.Skip("$INTEGRATION not set")
+	}
+	d := t.TempDir()
+	f := path.Join(d, "config.test.json")
+	b, err := ioutil.ReadFile("../config.json")
+	if err != nil {
+		t.Fatal(err)
+	}
+	if err := ioutil.WriteFile(f, b, os.ModePerm); err != nil {
+		t.Fatal(err)
+	}
+	os.Setenv("CONFIG", f)
+	if err := config.Refresh(nil); err != nil {
+		t.Fatal(err)
+	}
+	return NewMatrix()
+}
diff --git a/message/message.go b/message/message.go
index a1203b1..341d6fd 100644
--- a/message/message.go
+++ b/message/message.go
@@ -4,6 +4,8 @@ import "time"
 
 type Sender interface {
 	Send(string) error
+	SendTracked(string) (string, error)
+	Update(string, string) (string, error)
 	Receive() ([]Message, error)
 }