+(defcustom notmuch-address-post-completion-functions nil
+ "Functions called after completing address.
+
+The completed address is passed as an argument to each function.
+Note that this hook will be invoked for completion in headers
+matching `notmuch-address-completion-headers-regexp'.
+"
+ :type 'hook
+ :group 'notmuch-address
+ :group 'notmuch-hooks)
+