diff --git a/internal/sync/websocket.go b/internal/sync/websocket.go
index 8494c46..19bcf71 100644
--- a/internal/sync/websocket.go
+++ b/internal/sync/websocket.go
@@ -17,6 +17,9 @@ const (
 	MessageTypeSyncComplete     = "sync_complete"
 	MessageTypeHeartbeat        = "heartbeat"
 	MessageTypeInitial          = "initial_state"
+	MessageTypeScanProgress     = "scan_progress"
+	MessageTypeScanComplete     = "scan_complete"
+	MessageTypeScanError        = "scan_error"
 )
 
 // BroadcastMessage represents a message to broadcast to connected clients