public String getTooltipExtraText(final Province current) {
        // Default is to only show extra text for land provinces
        if (!editor.Main.map.isLand(current.getId()))
            return "";
        
        final String prop = mapPanel.getModel().getHistString(current.getId(), name);
        if (prop == null || prop.length() == 0)
            return "";
        return name + ": " + prop;
    }