PDF::Writer add_text_wrap

Wondering if anyone else had problems with the add_text_wrap of the
pdf-writer gem? I have something that looks like the following below,
but it does not wrap down to the next line, it just either runs off
the page or stops before the page, depending on the width of the
text_wrap. Anyone have any ideas?

@additional_items = @user.additional_items
pdf.add_text_wrap(310, 605, 300, @additional_items, 8)