for some reason, i was motivated to look at changing org-adapt-indentation. i found that the help text talked about values t, 'headline-data, and nil, but that the customization text didn't (though, of course, it *set* those values). the following might make it clearer.
diff --git a/lisp/org.el b/lisp/org.el index 2b50f94ee..5bb48c2fd 100644 --- a/lisp/org.el +++ b/lisp/org.el @@ -1605,10 +1605,10 @@ level-dependent indentation in a virtual way, i.e. at display time in Emacs." :group 'org-edit-structure :type '(choice - (const :tag "Adapt indentation for all lines" t) - (const :tag "Adapt indentation for headline data lines" + (const :tag "(t) Adapt indentation for all lines" t) + (const :tag "('headline-data) Adapt indentation for headline data lines" 'headline-data) - (const :tag "Do not adapt indentation at all" nil)) + (const :tag "(nil) Do not adapt indentation at all" nil)) :safe #'booleanp) (defvaralias 'org-special-ctrl-a 'org-special-ctrl-a/e)