diff --git a/windows.ui.viewmanagement/accessibilitysettings_highcontrastchanged.md b/windows.ui.viewmanagement/accessibilitysettings_highcontrastchanged.md
index 5220bdb6e..7d7382a99 100644
--- a/windows.ui.viewmanagement/accessibilitysettings_highcontrastchanged.md
+++ b/windows.ui.viewmanagement/accessibilitysettings_highcontrastchanged.md
@@ -14,6 +14,12 @@ Occurs when the system high contrast feature turns on or off.
 
 ## -remarks
 
+> [!WARNING]
+> This method will not work in WinUI 3 apps.
+>
+> Instead, use the [ThemeSettings.Changed](/windows/windows-app-sdk/api/winrt/microsoft.ui.system.themesettings.changed)
+> event. See [Mapping UWP APIs and libraries to the Windows App SDK](/windows/apps/windows-app-sdk/migrate-to-windows-app-sdk/api-mapping-table).
+
 ## -examples
 
 ## -see-also