diff --git a/screen_ui.h b/screen_ui.h
index d8ac85b..4319b76 100644
--- a/screen_ui.h
+++ b/screen_ui.h
@@ -34,6 +34,7 @@
 
     // overall recovery state ("background image")
     void SetBackground(Icon icon);
+    void SetSystemUpdateText(bool security_update);
 
     // progress indicator
     void SetProgressType(ProgressType type);