telegrambotapi ошибка Can't parse inline keyboard button: text buttons are unallowed in the inline keyboard

Пример кода

elif message.text == 'Пополнение стима':
        markup = types.InlineKeyboardMarkup()
        markup.add(types.InlineKeyboardButton('Пополнить стим'))
        steamdep = open('icons/steam.png', 'rb')
        bot.send_photo(message.chat.id, steamdep, caption='<b>Steam</b>', parse_mode='html', ReplyKeyboardMarkup=markup)