diff --git a/README.org b/README.org
index a0b535c..9085d41 100644
--- a/README.org
+++ b/README.org
@@ -1868,14 +1868,17 @@ file.
 | *pdf-view-fit-width-to-window*  | {{{kbd(W)}}}   |
 |---------------------------------+----------------|
 
-** Reading outline files
+** Reading news and outline files
 :PROPERTIES:
-:CUSTOM_ID: sec:reading-outline-files
+:CUSTOM_ID: sec:reading-news-outline-files
 :END:
 
-#+caption[Enable ~read-only-mode~ for some files in ~outline-mode~]:
-#+caption: Enable ~read-only-mode~ for some files in ~outline-mode~.
-#+name: lst:maybe-read-only-in-outline-mode
+Listing [[lst:maybe-read-only]] implements heuristics to enable =read-only-mode= for
+all =emacs-news-mode= and selected =outline-mode= files.
+
+#+caption[Enable =read-only-mode= for news and selected outline files]:
+#+caption: Enable =read-only-mode= for news and selected outline files.
+#+name: lst:maybe-read-only
 #+begin_src emacs-lisp -n :results silent
 (defun maybe-read-only-in-outline-mode ()
   "Check whether to open a file in `outline-mode' with `read-only-mode' enabled."
@@ -1884,12 +1887,19 @@ file.
     ;; GAV: `fnsd' is nil during Org export to LaTeX.
     (when fnsd
       (setq fnsd (file-name-nondirectory fnsd))
-      ;; These are files from the EMACS and ORG git repositories.
-      (when (member fnsd '("EGLOT-NEWS" "NEWS" "ORG-NEWS" "PROBLEMS"
-                           "org.org" "org-guide.org" "org-manual.org"))
+      ;; GAV: Handle files that do not open in `emacs-news-mode' from
+      ;; the EMACS and ORG git repositories (`cl-member' works too).
+      (when (or (string= fnsd "EGLOT-NEWS")
+                (string= fnsd "ORG-NEWS")
+                (string= fnsd "PROBLEMS")
+                (string= fnsd "org.org")
+                (string= fnsd "org-guide.org")
+                (string= fnsd "org-manual.org"))
         (message "Visit `%s' in `read-only-mode'" fnsd)
         (read-only-mode +1)))))
+
 (add-hook 'outline-mode-hook #'maybe-read-only-in-outline-mode)
+(add-hook 'emacs-news-mode-hook (lambda () (read-only-mode +1)))
 #+end_src
 
 * Writing