diff --git a/README.org b/README.org
index 4a0b140..0d09532 100644
--- a/README.org
+++ b/README.org
@@ -4743,8 +4743,7 @@ true in case document headlines contain links.  The code in listing
 #+name: lst:setup-which-function-mode
 #+begin_src emacs-lisp -n :results silent
 ;; https://emacs.stackexchange.com/questions/30894/
-;; https://list.orgmode.org/20240205.141235.268481480563517065.teika@gmx.com/
-
+;; (setopt which-func-display 'header) ;; AFAIU, fails on my system.
 (defvar which-func-functions nil)
 
 (defun which-func-org-function ()
@@ -4781,6 +4780,8 @@ Return \"Front Matter\" when point is above the first headline."
            (hl-page 0)
            (old-title "Front Matter")
            (new-title old-title))
+      ;; Return the first headline on a page which is better than nothing.
+      ;; I can't do better, since `pdf-view-mode' has no notion of point.
       (while (and (< hl-index hl-count) (< hl-page current-page))
         (setq old-title new-title)
         (setq hl-page (alist-get 'page (nth hl-index outline)))