+(defcustom viper-change-notification-threshold 1
+ "Notify the user when this many lines or characters have been deleted/yanked.
+For line-deleting/yanking commands (like `dd', `yy'), the value denotes the
+number of lines. For character-based commands (such as `x', `dw', etc.), the
+value refers to the number of characters affected."
+ :type 'integer
+ :group 'viper-misc)
+