diff --git a/README.org b/README.org
index d4ceb6f..2ba91f0 100644
--- a/README.org
+++ b/README.org
@@ -372,16 +372,16 @@ version.
 
 Mickey Peterson's post [[https://www.masteringemacs.org/article/how-to-get-started-tree-sitter?utm_source=newsletter&utm_medium=rss][How To Get Started with Tree-Sitter]] explains how to use
 =tree-sitter= in Emacs-29.1.  Listing [[lst:setup-treesit-sources][Setup =treesit= grammar sources]] configures
-where to find the different =tree-sitter= grammar sources for different
-languages.  Listing [[lst:setup-go][Setup Go programming]] shows how to configure ~tab-width~ for
-~go-ts-mod~ and ~go-mode-ts-mode~.
+for different =tree-sitter= grammar sources and maps =python-mode= to
+=python-ts-mode=.  Listing [[lst:setup-go][Setup Go programming]] shows how to configure
+~tab-width~ for ~go-ts-mod~ and ~go-mode-ts-mode~.
 
 #+caption[Setup =treesit= grammar sources]:
 #+caption: Setup =treesit= grammar sources.
 #+name: lst:setup-treesit-sources
 #+begin_src emacs-lisp -n :results silent
-(when (require 'treesit nil 'noerror)
-  (setopt
+(when (treesit-available-p)
+  (defvar
    treesit-language-source-alist
    '((bash "https://github.com/tree-sitter/tree-sitter-bash" "master" "src")
      (c "https://github.com/tree-sitter/tree-sitter-c" "master" "src")
@@ -389,7 +389,7 @@ languages.  Listing [[lst:setup-go][Setup Go programming]] shows how to configur
      (cpp "https://github.com/tree-sitter/tree-sitter-cpp" "master" "src")
      (css "https://github.com/tree-sitter/tree-sitter-css" "master" "src")
      (glsl "https://github.com/theHamsta/tree-sitter-glsl" "master" "src")
-     ;; go-ts-mode requires libtree-sitter-go and libtree-sitter-gomode.
+     ;; go-ts-mode requires libtree-sitter-go and libtree-sitter-gomod.
      (go "https://github.com/tree-sitter/tree-sitter-go" "master" "src")
      (gomod "https://github.com/camdencheek/tree-sitter-go-mod" "main" "src")
      (html "https://github.com/tree-sitter/tree-sitter-html" "master" "src")
@@ -412,7 +412,10 @@ languages.  Listing [[lst:setup-go][Setup Go programming]] shows how to configur
           "master" "tsx/src")
      (typescript "https://github.com/tree-sitter/tree-sitter-typescript"
                  "master" "typescript/src")
-     (yaml "https://github.com/ikatyang/tree-sitter-yaml" "master" "src"))))
+     (yaml "https://github.com/ikatyang/tree-sitter-yaml" "master" "src")))
+
+  ;; GAV: Building a grammar may fix no or poor `treesit' fontification.
+  (setopt major-mode-remap-alist '((python-mode . python-ts-mode))))
 #+end_src
 
 * [[info:emacs#Faces][Text faces or styles (info)]]