diff --git a/README.org b/README.org
index e1efbf8..4b025c4 100644
--- a/README.org
+++ b/README.org
@@ -2243,22 +2243,23 @@ list detailing and motivating each listing:
    "org-lint")}.
 5. Listing [[lst:set-org-link-options]] handles [[https://orgmode.org/][Org-mode]] options specific to
    [[info:org#Hyperlinks][hyperlinks (info)]].
-6. Listing [[lst:setup-org-mode-map-1]] and [[lst:setup-org-mode-map-2]] extend the
+6. Listing [[lst:looking-at-org-id]] enables recent ~org-id~ features.
+7. Listing [[lst:setup-org-mode-map-1]] and [[lst:setup-org-mode-map-2]] extend the
    =org-mode-map= with useful key-bindings.
-7. Listing [[lst:setup-org-src]] facilitates [[info:org#Editing Source Code][editing source code blocks]], and it
+8. Listing [[lst:setup-org-src]] facilitates [[info:org#Editing Source Code][editing source code blocks]], and it
    provides functions to change the indentation of all =org-src-mode= blocks.
-8. Listing [[lst:setup-ob-python]] allows to pretty-print Python session source
+9. Listing [[lst:setup-ob-python]] allows to pretty-print Python session source
    block values with [[https://github.com/psf/black#readme][black]] instead of [[https://docs.python.org/3/library/pprint.html][pprint]].  This snippet may break in the
    future, because it sets =org-babel-python--def-format-value= which is a
    constant declared "private" by two dashes in its name!
-9. Listing [[lst:set-org-export-options]] selects the =non-intrusive= expert user
-   interface for export dispatching.
-10. Listing [[lst:setup-org-for-lualatex-export]] and
+10. Listing [[lst:set-org-export-options]] selects the =non-intrusive= expert user
+    interface for export dispatching.
+11. Listing [[lst:setup-org-for-lualatex-export]] and
     [[lst:set-ox-latex-options-for-lualatex-export]] configure [[https://orgmode.org/][Org-mode]] to generate
     output for the LuaLaTeX compiler.
-11. Listing [[lst:setup-org-latex-classes]] defines [[info:org#LaTeXspecificexportsettings][org-latex-classes (info)]] for
-    backward compatibility.  Type {{{kbd(C-h v org-latex-classes)}}} for an
-    explanation of the code in listing [[lst:setup-org-latex-classes]].
+12. Listing [[lst:setup-org-latex-classes]] defines [[info:org#LaTeXspecificexportsettings][org-latex-classes (info)]] for
+    backward compatibility.  For an explanation of the code in listing
+    [[lst:setup-org-latex-classes]], type {{{kbd(C-h v org-latex-classes)}}}.
 
 #+caption[Set basic =Org= options]:
 #+caption: Set basic =Org= options.
@@ -2382,6 +2383,22 @@ Watch out for completion `visit-tags-table' prompts."
           org-link-search-must-match-exact-headline nil))
 #+end_src
 
+#+caption[Looking at =org-id=]:
+#+caption: Looking at =org-id=.
+#+name: lst:looking-at-org-id
+#+begin_src emacs-lisp -n :results silent
+(with-eval-after-load 'org-id
+  (setopt org-id-link-to-org-use-id t
+          org-id-track-globally t)
+  ;; https://stackoverflow.com/a/16247032 answers
+  ;; "How to assign IDs to all entries in a buffer."
+  (defun org-id-add-ids-to-headlines-in-buffer ()
+    "Add slowly ID properties to all headlines without such an ID property.
+Undo this by means of `org-delete-property-globally'."
+    (interactive)
+    (org-map-entries #'org-id-get-create)))
+#+end_src
+
 #+caption[Setup =org-mode-map= 1]:
 #+caption: Setup =org-mode-map= 1.
 #+name: lst:setup-org-mode-map-1