diff --git a/core/tavern.go b/core/tavern.go
index 49af6ac..d415722 100644
--- a/core/tavern.go
+++ b/core/tavern.go
@@ -267,26 +267,31 @@ func (tv *Tavern) RegisterHandlers(ctx context.Context, serveMux *http.ServeMux,
 	return nil
 }
 
-type tavernCommandMessage struct {
-	Cmd  string
-	Args []string
-}
-
 func (sub *subTavern) clientMessageReceived(sender *wshandler.Sender, messageType wshandler.WebSocketMessageType, body io.Reader) {
 	if messageType == wshandler.Connected {
 		sub.cm.add(sender.Accid, sender.Alias)
 	} else if messageType == wshandler.Disconnected {
 		sub.cm.remove(sender.Accid)
 	} else if messageType == wshandler.BinaryMessage {
-		var msg tavernCommandMessage
+		var msg map[string][]any
 		dec := json.NewDecoder(body)
 		if err := dec.Decode(&msg); err == nil {
-			switch msg.Cmd {
-			case "EnterChannel":
-				sub.wsh.EnterRoom(sub.region, msg.Args[0], sender.Accid)
+			for cmd, args := range msg {
+				switch cmd {
+				case "EnterChannel":
+					sub.wsh.EnterRoom(sub.region, args[0].(string), sender.Accid)
 
-			case "LeaveChannel":
-				sub.wsh.LeaveRoom(sub.region, msg.Args[0], sender.Accid)
+				case "LeaveChannel":
+					sub.wsh.LeaveRoom(sub.region, args[0].(string), sender.Accid)
+
+				case "UpdateGroupMemberDocument":
+					typename := args[0].(string)
+					gidobj, _ := primitive.ObjectIDFromHex(args[1].(string))
+					doc := args[2].(map[string]any)
+					if group := sub.groups[typename]; group != nil {
+						group.UpdateMemberDocument(gidobj, sender.Accid, doc)
+					}
+				}
 			}
 		}
 	}