   :group 'radian
   :type `(choice ,@(mapcar (lambda (theme)
                              `(const :tag
-                                ,(radian--unlispify
-                                  (symbol-name theme))
+                                ,(if theme
+                                     (radian--unlispify
+                                      (symbol-name theme))
+                                   "None")
                                 ,theme))
-                           (custom-available-themes))))
+                           (cons
+                            nil
+                            (sort
+                             (append
+                              (custom-available-themes)
+                              '(zerodark))
+                             #'string-lessp)))))
 
 ;; This is a handy macro for conditionally enabling color theme
 ;; customizations.

;;; radian-theme.el --- Loading color themes

(require 'radian-custom)

;;; See also `radian-appearance'.


  ;; Eliminate the underline on mismatched parens.
  (set-face-underline 'show-paren-mismatch nil))

(straight-register-package 'zerodark-theme)
(radian-with-color-theme zerodark
  (use-package zerodark-theme))

;; Load the appropriate color scheme as specified in
;; `radian-color-theme'.
(when radian-color-theme
