diff --git a/config/config.go b/config/config.go
index 54cae61..5720201 100644
--- a/config/config.go
+++ b/config/config.go
@@ -13,6 +13,7 @@ type (
 		LogLevel               string
 		MatrixIdentityServer   string
 		MatrixWellKnownAddress string
+		MatrixMsc3575Address   string
 		NostrAddrFee           string
 	}
 )
@@ -26,6 +27,7 @@ func GetConfig() Config {
 		LogLevel:               getEnv("LOG_LEVEL", "INFO"),
 		MatrixIdentityServer:   getEnv("MATRIX_IDENTITY_SERVER", ""),
 		MatrixWellKnownAddress: getEnv("MATRIX_WELL_KNOWN_ADDRESS", ""),
+		MatrixMsc3575Address:   getEnv("MATRIX_MSC3575_ADDRESS", ""),
 		NostrAddrFee:           getEnv("NOSTR_ADDR_FEE", "0"),
 	}
 }
diff --git a/matrix/matrix.go b/matrix/matrix.go
index 18aec9d..70e88ee 100644
--- a/matrix/matrix.go
+++ b/matrix/matrix.go
@@ -21,9 +21,14 @@ type matrixIdentityServer struct {
 	BaseUrl string `json:"base_url,omitempty"`
 }
 
+type msc3575address struct {
+	Url string `json:"url,omitempty"`
+}
+
 type matrixClientWellKnown struct {
-	HomeServer     *matrixBaseUrl        `json:"m.homeserver"`
+	Homeserver     *matrixBaseUrl        `json:"m.homeserver"`
 	IdentityServer *matrixIdentityServer `json:"m.identity_server,omitempty"`
+	Msc3575        *msc3575address       `json:"org.matrix.msc3575.proxy,omitempty"`
 }
 
 func MatrixServer(w http.ResponseWriter, req *http.Request) {
@@ -46,36 +51,33 @@ func MatrixServer(w http.ResponseWriter, req *http.Request) {
 
 func MatrixClient(w http.ResponseWriter, req *http.Request) {
 	l := logger.Get()
-	// uses an environment variable for now
+	m := &matrixClientWellKnown{}
+
 	wellKnownAddr := config.GetConfig().MatrixWellKnownAddress
+	// no matrix config set
 	if wellKnownAddr == "" {
 		w.WriteHeader(http.StatusNotFound)
 		l.Debug().Str("path", "matrix/client").Msg("matrix well known address unset")
 		return
 	}
 
-	identityServer := config.GetConfig().MatrixIdentityServer
-	if identityServer == "" {
-		w.Header().Set("Content-Type", "application/json")
-		w.WriteHeader(http.StatusOK)
-		baseUrl := &matrixClientWellKnown{
-			HomeServer: &matrixBaseUrl{
-				BaseUrl: fmt.Sprintf("https://%s", wellKnownAddr),
-			},
-		}
-		json.NewEncoder(w).Encode(baseUrl)
-	} else {
-		identityServer = fmt.Sprintf("https://%s", identityServer)
-		w.Header().Set("Content-Type", "application/json")
-		w.WriteHeader(http.StatusOK)
-		baseUrl := &matrixClientWellKnown{
-			HomeServer: &matrixBaseUrl{
-				BaseUrl: fmt.Sprintf("https://%s", wellKnownAddr),
-			},
-			IdentityServer: &matrixIdentityServer{
-				BaseUrl: identityServer,
-			},
-		}
-		json.NewEncoder(w).Encode(baseUrl)
+	m.Homeserver = &matrixBaseUrl{
+		BaseUrl: fmt.Sprintf("https://%s", wellKnownAddr),
 	}
+
+	identityServer := config.GetConfig().MatrixIdentityServer
+	if identityServer != "" {
+		m.IdentityServer = &matrixIdentityServer{
+			BaseUrl: identityServer,
+		}
+	}
+
+	msc3575 := config.GetConfig().MatrixMsc3575Address
+	if msc3575 != "" {
+		m.Msc3575 = &msc3575address{
+			Url: msc3575,
+		}
+	}
+	w.WriteHeader(http.StatusOK)
+	json.NewEncoder(w).Encode(m)
 }