Configure which-key-mode

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@@ -556,6 +556,20 @@ previous input in the minibuffer.
   (define-key minibuffer-local-map [C-tab] 'my-minibuffer-complete-history)
 #+end_src
 
+** Prefix key-binding help
+
+Configure ~which-key-mode~ so that typing =C-h= after a prefix key displays all
+keys available after the prefix key.
+
+#+begin_src emacs-lisp
+  (when (fboundp 'which-key-mode)
+    (custom-set-variables
+     '(which-key-idle-delay 10000)
+     '(which-key-idle-secondary-delay 0.05)
+     '(which-key-show-early-on-C-h t))
+    (which-key-mode +1))
+#+end_src
+
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