woman-imenu-generic-expression

woman-imenu-generic-expression is a variable defined in `woman.el'.
Its value is

((nil "\n\\([A-Z].*\\)" 1)
 ("*Subsections*" "^   \\([A-Z].*\\)" 1))

Documentation:
Imenu support for Sections and Subsections.
An alist with elements of the form (MENU-TITLE REGEXP INDEX) --
see the documentation for `imenu-generic-expression'.

You can customize this variable.