sections_count = 0

if FORMAT:match 'html' then
    function Header(el)

        if not (el.level == 2) then
            return el
        end
        local numb = pandoc.Str(tostring(sections_count + 1)..".")
        sections_count = sections_count + 1
        local new_cont = {numb, pandoc.Space()}
        for i,v in ipairs(el.content) do
            new_cont[i+2]=el.content[i]
        end
        el.content = new_cont
        return el
    end
end