diff --git a/etc/NEWS b/etc/NEWS
index b63d10fd978..3560c9d34e8 100644
--- a/etc/NEWS
+++ b/etc/NEWS
@@ -2400,7 +2400,7 @@ This command, called interactively, toggles the local value of
 
 ---
 *** 'shell-script-mode' now supports 'outline-minor-mode'.
-The outline headings have lines that start with "##".
+The outline headings have lines that start with "###".
 
 +++
 *** New command 'revert-buffer-quick'.
diff --git a/lisp/progmodes/sh-script.el b/lisp/progmodes/sh-script.el
index 8fcb311ff1f..b6674731ddf 100644
--- a/lisp/progmodes/sh-script.el
+++ b/lisp/progmodes/sh-script.el
@@ -1532,7 +1532,7 @@ with your script for an edit-interpret-debug cycle."
   (setq-local add-log-current-defun-function #'sh-current-defun-name)
   (add-hook 'completion-at-point-functions
             #'sh-completion-at-point-function nil t)
-  (setq-local outline-regexp "##")
+  (setq-local outline-regexp "###")
   ;; Parse or insert magic number for exec, and set all variables depending
   ;; on the shell thus determined.
   (sh-set-shell