How to make a bold header in a Prawn table

Question

I'm using Prawn and need to make the Header row bold but I can't find any solution in the API.

Here you can see my current table with normal text Headers

pdf.table (Data, :header => true) do
  table.header=(["Header1", "Header2", "Header3", "Header4"])        
end

Answer 1

Its just as simple as I thought

pdf.table Data, {:header => true} do |table|
    table.header=(["Header1", "Header2", "Header3", "Header4"])     
    table.row(0).font_style = :bold
end