diff --git a/README.org b/README.org
index f267de7..7627a9b 100644
--- a/README.org
+++ b/README.org
@@ -33,6 +33,7 @@
 :END:
 
 Backup your =~/.emacs.d= directory to execute the following commands:
+#+attr_latex: :options bgcolor=LightGoldenrodYellow
 #+begin_src shell :noeval :tangle no
   cd ~
   git clone ccdr@mercury.grenoble.cnrs.fr:SERVER/.emacs.d
@@ -111,6 +112,9 @@ Here follows a list of interesting Emacs configurations:
 :CUSTOM_ID: sec:early-init-file
 :END:
 
+Try to load [[https://github.com/emacscollective/no-littering][no-littering]] as early as possible, since it helps to keep
+=~/.emacs.d= clean.
+
 #+attr_latex: :options bgcolor=LightGoldenrodYellow
 #+begin_src emacs-lisp :tangle early-init.el
   ;;; early-init.el --- user early-init file        -*- lexical-binding: t -*-
@@ -243,15 +247,13 @@ not load the ~custom-file~ as [[info:emacs#Saving Customizations][saving customi
 archives:
 1. The [[https://elpa.gnu.org/][GNU Emacs Lisp Package Archive]]
 2. The [[https://elpa.nongnu.org/][NonGNU Emacs Lisp Package Archive]].
-3. The [[https://melpa.org/#/][MELPA - Milkypostman’s Emacs Lisp Package Archive]].
+3. The [[https://melpa.org/#/][Milkypostman’s Emacs Lisp Package Archive (MELPA)]].
 Finally, the [[https://github.com/quelpa/quelpa][quelpa]] tool allows to fetch code from any source and build a
 package on your computer before installation.
 
 The order of the next two package-bootstrapping blocks matters
 because first block prepares Emacs for the second block.
 
-If present, the package [[https://github.com/emacscollective/no-littering][no-littering]] helps to keep =~/.emacs.d= clean.
-
 The code assumes that the package system is in a *virgin* state in case the
 package [[https://github.com/emacscollective/no-littering][no-littering]] is not present.  Refreshing the contents of available
 packages at least once is a requirement in order to be able to install and load
@@ -260,9 +262,9 @@ any packages, hence also [[https://github.com/emacscollective/no-littering][no-l
 You have to refresh the list of available packages yourself before updating
 the installed packages.
 
-The call src_emacs-lisp[:exports_code]{(package-install-selected-packages)}
+The call src_emacs-lisp[:exports code]{(package-install-selected-packages)}
 checks the installation status of all packages in
-src_emacs-lisp[:exports_code]{package-selected-packages} and installs the
+src_emacs-lisp[:exports code]{package-selected-packages} and installs the
 missing packages after the user has agreed to its prompt.
 
 Finally, ~my-install-packages~ facilitates installation of all packages in a
@@ -287,7 +289,7 @@ list of packages.
 #+end_src
 
 The next source code block facilitates installlation of the optional package,
-The user can run src_emacs-lisp[:exports_code]{(my-install-optional-packages)}
+The user can run src_emacs-lisp[:exports code]{(my-install-optional-packages)}
 to install all optional packages, or he can install each package one by one.
 
 #+attr_latex: :options bgcolor=LightGoldenrodYellow
@@ -446,6 +448,7 @@ niche than the five packages above.
 :CUSTOM_ID: sec:orderless-configuration
 :END:
 
+#+attr_latex: :options bgcolor=LightGoldenrodYellow
 #+begin_src emacs-lisp
   (unless noninteractive
     (when (fboundp 'orderless-filter)
@@ -569,8 +572,8 @@ annotate [[https://en.wikipedia.org/wiki/PDF][PDF]] files.  It also exploits the
 files produced with LaTeX to the original LaTeX sources.
 
 In order to use [[https://github.com/vedang/pdf-tools][pdf-tools]], you have to type =M-x pdf-tools-install= after
-installation of [[https://github.com/vedang/pdf-tools][pdf-tools]] from [[https://melpa.org/][MELPA]] or after each update of [[https://github.com/freedesktop/poppler][poppler]] to build
-or rebuild the =epdfinfo= executable that serves the [[https://en.wikipedia.org/wiki/PDF][PDF]] files to Emacs.
+installation of [[https://github.com/vedang/pdf-tools][pdf-tools]] from [[https://melpa.org/][MELPA]] or after each update of [[https://github.com/freedesktop/poppler][poppler]] to build or
+rebuild the =epdfinfo= executable that serves the [[https://en.wikipedia.org/wiki/PDF][PDF]] files to Emacs.
 
 #+attr_latex: :options bgcolor=LightGoldenrodYellow
 #+begin_src emacs-lisp
@@ -717,6 +720,7 @@ below corrects this by advising to override ~TeX-brace-count-line~ with
 :CUSTOM_ID: sec:export-external-links
 :END:
 
+#+attr_latex: :options bgcolor=LightGoldenrodYellow
 #+begin_src emacs-lisp
   (with-eval-after-load 'ol
     (org-link-set-parameters
@@ -747,7 +751,7 @@ below corrects this by advising to override ~TeX-brace-count-line~ with
      "ref" :export (lambda (path _desc backend _info)
                      (pcase backend
                        (`latex
-                        (format "\\ref{%s}" path))
+                        (format "\\ref{% s}" path))
                        (_ path)))))
 
 #+end_src
@@ -757,6 +761,7 @@ modify the constant ~org-info-other-documents~ defined in =ol-info.el=.
 
 Note: how to make it work without tangling?
 
+#+attr_latex: :options bgcolor=LightGoldenrodYellow
 #+begin_src emacs-lisp
   (add-hook
    'org-mode-hook
@@ -853,6 +858,7 @@ Stolen from [[https://git.sr.ht/~bzg/org-contrib/tree/master/item/lisp/ox-extra.
 #+end_src
 
 #+name: emacs-lisp-setup
+#+attr_latex: :options bgcolor=LightGoldenrodYellow
 #+begin_src emacs-lisp :tangle no
   (with-eval-after-load 'ox
     (my-activate-buffer-local-org-export-filters))
@@ -974,6 +980,7 @@ option to run different commands on those selections.
 Execute src_emacs-lisp[:exports code]{(find-library "novice")} to see how
 Emacs prevents new users from shooting themselves in the feet.
 
+#+attr_latex: :options bgcolor=LightGoldenrodYellow
 #+begin_src emacs-lisp
   (setq disabled-command-function
         (defun my-enable-this-command (&rest _args)
@@ -994,6 +1001,7 @@ Emacs prevents new users from shooting themselves in the feet.
 
 [[https://endlessparentheses.com/emacs-narrow-or-widen-dwim.html][Emacs narrow-or-widen-dwim]]
 
+#+attr_latex: :options bgcolor=LightGoldenrodYellow
 #+begin_src emacs-lisp
   (defun narrow-or-widen-dwim (p)
     "Widen if buffer is narrowed, narrow-dwim otherwise.
@@ -1101,6 +1109,7 @@ Emacs prevents new users from shooting themselves in the feet.
 
 * Coding
 
+#+attr_latex: :options bgcolor=LightGoldenrodYellow
 #+begin_src emacs-lisp
   (with-eval-after-load 'eglot
     (add-to-list 'eglot-server-programs '(python-mode "pylsp"))
@@ -1124,8 +1133,10 @@ built-in ~python-mode~. Here, the focus is on two packages:
    shows.
 
 The snippet below initializes [[https://github.com/pythonic-emacs/anaconda-mode][anaconda]]. See [[https://github.com/jorgenschaefer/elpy/blob/8d0de310d41ebf06b22321a8534546447456870c/elpy.el#L2775][elpy-module-company]] for how to
-handle ~company-backends~ as a local variable and the call to ~advice~ opens
+handle ~company-backends~ as a local variable and the call to [[info:elisp#Advising Functions][advice-add]] opens
 Python org-mode edit-buffers in ~anaconda-mode~.
+
+#+attr_latex: :options bgcolor=LightGoldenrodYellow
 #+begin_src emacs-lisp
   (with-eval-after-load 'python
 
@@ -1242,6 +1253,7 @@ The next source code blocks implement those rules.
 In case of proper initialization of all face heigths, font scaling is easy as
 the next source code block shows.
 
+#+attr_latex: :options bgcolor=LightGoldenrodYellow
 #+begin_src emacs-lisp
   (defun my-set-default-face-height ()
     "Set the default face height in all current and future frames.