diff --git a/boon-core.el b/boon-core.el
index c4d4e53..305fa5c 100644
--- a/boon-core.el
+++ b/boon-core.el
@@ -11,6 +11,9 @@
 
 ;; Maps
 
+(defgroup boon nil "Boon" :group 'Editing)
+
+(defvar boon-x-map)
 (define-prefix-command 'boon-x-map)
 (set-keymap-parent boon-x-map ctl-x-map)
 
diff --git a/boon-utils.el b/boon-utils.el
index 2b82329..ea972ef 100644
--- a/boon-utils.el
+++ b/boon-utils.el
@@ -14,7 +14,7 @@
        ,body
        (progn (exchange-point-and-mark) ,body (exchange-point-and-mark))))
 
-(defcustom boon-hints-enabled 't "Display hints." :group 'boon)
+(defcustom boon-hints-enabled 't "Display hints." :group 'boon :type 'boolean)
 
 (defun boon-hint (msg)
   "Provide MSG as a hint."