diff --git a/README.org b/README.org
index 6832cf9..09c14f7 100644
--- a/README.org
+++ b/README.org
@@ -2141,8 +2141,9 @@ When called twice, replace the previously inserted \\(\\) by one $."
 #+name: lst:customize-org-src
 #+begin_src emacs-lisp
 (with-eval-after-load 'emacs
-  (custom-set-variables
-   '(org-src-preserve-indentation t))
+  (with-eval-after-load 'org-src
+    (custom-set-variables
+     '(org-src-preserve-indentation t)))
 
   (declare-function org-babel-map-src-blocks "ext:ob-core" (file &rest body))
   (declare-function org-do-remove-indentation "ext:org-macs" (n skip-fl))
@@ -4191,7 +4192,9 @@ and listing [[lst:setting-python-shell-virtualenv-root]] to set
           `(org-babel-python-command
             ,(concat (or (executable-find "ipython3")
                          (executable-find "ipython"))
-                     " --simple-prompt --HistoryAccessor.enabled=False"))))))
+                     " --simple-prompt --HistoryAccessor.enabled=False")))))
+      (message "Now `org-babel-python-command' equals %S"
+               org-babel-python-command))
     (when (boundp 'python-shell-interpreter)
       (pcase choice
         ("python"
@@ -4204,7 +4207,9 @@ and listing [[lst:setting-python-shell-virtualenv-root]] to set
           `(python-shell-interpreter
             ,(or (executable-find "ipython3") (executable-find "ipython")))
           '(python-shell-interpreter-args
-            "--simple-prompt --HistoryAccessor.enabled=False")))))))
+            "--simple-prompt --HistoryAccessor.enabled=False"))))
+      (message "Now `python-shell-interpreter' equals %S"
+               python-shell-interpreter))))
 #+end_src
 
 #+caption[Manage =pyenv=]:
@@ -4263,10 +4268,10 @@ Complete the result with \"system\"."
                               pyenv-versions
                               pyenv-virtualenvs))
     (setq python-shell-virtualenv-root
-          (pyenv-full-path (or (car `(,(pyenv-version-name)))
+          (pyenv-full-path (or (pyenv-version-name)
                                (car (pyenv-virtualenvs))
                                (car (pyenv-versions)))))
-    (message "Now `python-shell-virtualenv-root' equals \"%s\""
+    (message "Now `python-shell-virtualenv-root' equals %S"
              python-shell-virtualenv-root)
 
     (defun set-python-shell-virtualenv-root-to-pyenv-version ()
@@ -4279,7 +4284,7 @@ Complete the result with \"system\"."
         (unless (string= version-name version)
           (setq python-shell-virtualenv-root (pyenv-full-path version))
           (setenv "PYENV_VERSION" version))
-        (message "Now `python-shell-virtualenv-root' equals \"%s\""
+        (message "Now `python-shell-virtualenv-root' equals %S"
                  python-shell-virtualenv-root)))
 
     (defun set-python-shell-virtualenv-root-to-pyenv-virtualenv ()
@@ -4292,7 +4297,7 @@ Complete the result with \"system\"."
         (unless (string= version-name version)
           (setq python-shell-virtualenv-root (pyenv-full-path version))
           (setenv "PYENV_VERSION" version))
-        (message "Now `python-shell-virtualenv-root' equals \"%s\""
+        (message "Now `python-shell-virtualenv-root' equals %S"
                  python-shell-virtualenv-root)))))
 #+end_src