diff --git a/src/script/api/script_window.hpp b/src/script/api/script_window.hpp
--- a/src/script/api/script_window.hpp
+++ b/src/script/api/script_window.hpp
@@ -2495,6 +2495,7 @@ public:
 	/** Widgets of the #TownAuthorityWindow class. */
 	enum TownAuthorityWidgets {
 		WID_TA_CAPTION                               = ::WID_TA_CAPTION,                               ///< Caption of window.
+		WID_TA_ZONE_BUTTON                           = ::WID_TA_ZONE_BUTTON,                           ///< Turn on/off showing local authority zone.
 		WID_TA_RATING_INFO                           = ::WID_TA_RATING_INFO,                           ///< Overview with ratings for each company.
 		WID_TA_COMMAND_LIST                          = ::WID_TA_COMMAND_LIST,                          ///< List of commands for the player.
 		WID_TA_SCROLLBAR                             = ::WID_TA_SCROLLBAR,                             ///< Scrollbar of the list of commands.