diff --git a/README.org b/README.org
index f3c7a80..d18de95 100644
--- a/README.org
+++ b/README.org
@@ -321,15 +321,19 @@ the contents of packages and allows to update packages to the latest version.
       ;; Install the selected packages.
       (package-install-selected-packages)))
 
+  (defun ensure-package-selection (package)
+    "Ensure selection of PACKAGE."
+    (when (and (package-installed-p package)
+               (bound-and-true-p package-selected-packages))
+      (cl-pushnew package package-selected-packages)))
+
   (defun ensure-package-installation (&rest packages)
     "Ensure installation of all packages in PACKAGES."
     (let ((ok t))
       (dolist (package packages)
         (unless (package-installed-p package)
           (package-install package))
-        (if (package-installed-p package)
-            (when (bound-and-true-p package-selected-packages)
-              (cl-pushnew package package-selected-packages))
+        (unless (ensure-package-selection package)
           (setq ok nil)))
       ok))
 #+end_src
@@ -3772,7 +3776,8 @@ support.
   (when (and (executable-find "fennel")
              (ensure-package-installation 'fennel-mode 'quelpa))
     (unless (package-installed-p 'ob-fennel)
-      (quelpa '(ob-fennel :repo "andreyorst/ob-fennel" :fetcher gitlab))))
+      (quelpa '(ob-fennel :repo "andreyorst/ob-fennel" :fetcher gitlab)))
+    (ensure-package-selection 'ob-fennel))
 #+end_src
 
 #+caption[Fennel example]:
@@ -3792,7 +3797,7 @@ support.
 #+name: lst:install-lua-mode
 #+begin_src emacs-lisp
   (when (and (executable-find "lua")
-             (ensure-package-installation 'lua-mode)))
+             (ensure-package-installation 'company-lua 'lua-mode)))
 #+end_src
 
 #+caption[Lua example]: