+notmuch (0.21~rc1-1) experimental; urgency=medium
+
+ * This release of notmuch requires a non-reversible database upgrade
+ to support database revision tracking. This upgrade will happen on
+ the first run of 'notmuch-new' after updating. Notmuch will backup
+ your tags for your before doing the upgrade, but it never hurts to
+ make your own backup with notmuch dump.
+
+ -- David Bremner <bremner@debian.org> Thu, 15 Oct 2015 08:13:04 -0300
+