_p = self._str_i.add_paragraph("Table of Contents")
paragraph = self._str_i.add_paragraph()
run = paragraph.add_run()
fldChar = OxmlElement('w:fldChar')  # creates a new element
fldChar.set(qn('w:fldCharType'), 'begin')  # sets attribute on element
instrText = OxmlElement('w:instrText')
instrText.set(qn('xml:space'), 'preserve')  # sets attribute on element
instrText.text = 'TOC \\o "1-5" \\h \\z \\u'   # change 1-5 depending on heading levels you need
fldChar2 = OxmlElement('w:fldChar')
fldChar2.set(qn('w:fldCharType'), 'separate')
fldChar3 = OxmlElement('w:t')
fldChar3.text = "Right-click to update table of contents!!."
fldChar2.append(fldChar3)
fldChar4 = OxmlElement('w:fldChar')
fldChar4.set(qn('w:fldCharType'), 'end')
r_element = run._r
r_element.append(fldChar)
r_element.append(instrText)
r_element.append(fldChar2)
r_element.append(fldChar4)
p_element = paragraph._p