diff --git a/whisper_local/tray/_tray.py b/whisper_local/tray/_tray.py
index 4ff255b..8b253d7 100644
--- a/whisper_local/tray/_tray.py
+++ b/whisper_local/tray/_tray.py
@@ -43,6 +43,11 @@ class PystrayApp:
             from whisper_local.tray._icon import create_icon
             self._icon.icon = create_icon(state)
 
+    def set_warning(self, msg: str | None) -> None:
+        """Setzt Tray-Titel auf Warnung oder zurück auf normal (thread-sicher)."""
+        if self._icon is not None:
+            self._icon.title = "whisper-local" if msg is None else f"whisper-local ⚠ {msg}"
+
     def _menu_settings(self, icon, item) -> None:
         self._on_settings()
 
@@ -60,3 +65,6 @@ class NoOpTray:
 
     def set_state(self, state: AppState) -> None:
         pass
+
+    def set_warning(self, msg: str | None) -> None:
+        pass