+;;
+;; NOTE: As of June 2015, this feature requires newer versions of
+;; GnuPG (2.1.5+) and Pinentry (not yet released, possibly 0.9.5+).
+;; For details, see the discussion on gnupg-devel mailing list:
+;; <https://lists.gnupg.org/pipermail/gnupg-devel/2015-May/029875.html>.