diff --git a/lisp/progmodes/hideshow.el b/lisp/progmodes/hideshow.el
index 07d7236c9b4..d01f855a7f8 100644
--- a/lisp/progmodes/hideshow.el
+++ b/lisp/progmodes/hideshow.el
@@ -338,7 +338,7 @@ size."
            :face hs-indicator-hide
            :height (0.6 . em)
            :ascent center)
-    (symbol "🞃" "▼" :face hs-indicator-hide)
+    (symbol "▾" "▼" :face hs-indicator-hide)
     (text "-" :face hs-indicator-hide))
   "Icon used for hide block at point.
 This is only used if `hs-indicator-type' is set to `margin' or nil."
@@ -413,10 +413,12 @@ whitespace.  Case does not matter.")
 (defvar hs-hide-all-non-comment-function nil
   "Function called if non-nil when doing `hs-hide-all' for non-comments.")
 
-(defvar hs-allow-nesting nil
+(defcustom hs-allow-nesting nil
   "If non-nil, hiding remembers internal blocks.
 This means that when the outer block is shown again,
-any previously hidden internal blocks remain hidden.")
+any previously hidden internal blocks remain hidden."
+  :type 'boolean
+  :version "31.1")
 
 (defvar hs-hide-hook nil
   "Hook called (with `run-hooks') at the end of commands to hide text.