Ensure keycast installation in its own section

README.org

@@ -215,7 +215,6 @@ The [[info:emacs#Init File][init file (info)]] does not load the ~custom-file~ a
        embark             ; act on any buffer selection
        htmlize            ; convert buffer contents to HTML
        iedit              ; simultaneous multi-entity editing
-       keycast            ; show current command with binding
        magit              ; Git Text-based User Interface
        marginalia         ; minibuffer margin notes
        no-littering       ; keep `user-emacs-directory' clean
@@ -677,6 +676,25 @@ users from shooting themselves in the feet.  Listing
             (call-interactively this-command))))
 #+end_src
 
+** [[https://github.com/tarsius/keycast#readme][Keycast]]
+:PROPERTIES:
+:CUSTOM_ID: sec:keycast
+:END:
+
+Listing [[lst:configure-keycast]] configures =keycast=.
+
+#+caption[Configure =keycast=]:
+#+caption: Configure =keycast=.
+#+name: lst:configure-keycast
+#+begin_src emacs-lisp
+  (when (ensure-package-installation 'keycast)
+    ;; TODO: make `keycast-log-update-buffer' use a buffer similar to
+    ;; the control buffer `ediff-setup-windows-plain' returns.
+    (with-eval-after-load 'keycast
+      (custom-set-variables
+       '(keycast-mode-line-window-predicate 'keycast-bottom-right-window-p))))
+#+end_src
+
 * [[info:emacs#Emacs Server][Using Emacs as a server (info)]]
 :PROPERTIES:
 :CUSTOM_ID: sec:using-emacs-server