+Notmuch-emacs documentation is somewhat expanded. More contributions
+are very welcome.
+
+Build System
+------------
+
+Notmuch release tarballs are now compressed with `xz`.
+
+We now provide conventional detached signatures of the release
+tarballs in addition to the signed `sha256sum` files.
+
+Dependencies
+------------
+
+Support for GMime 2.6 is removed. The minimum supported version of
+GMime is now 3.0.3. GMime also needs to have been compiled with
+cryptography support.
+
+Test Suite
+----------
+
+If either GNU parallel or moreutils parallel is installed, the tests
+in the test suite will now be run in parallel (one per available
+core). This can be disabled with NOTMUCH_TEST_SERIALIZE=1.
+
+Notmuch 0.28.4 (2019-05-05)
+===========================
+
+Command line interface
+----------------------
+
+Fix a spurious error when using `notmuch show --raw` on messages whose
+size is a multiple of the internal buffer size.
+