import textwrap


def _dedent_under_first_line(text: str) -> str:
    """
    Apply textwrap.dedent ignoring the first line.
    """
    lines = text.splitlines()
    other_lines = "\n".join(lines[1:])
    if other_lines:
        return f"{lines[0]}\n{textwrap.dedent(other_lines)}"
    return text