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+2016-01-01  Moritz Bunkus  <moritz@bunkus.org>
+
+        * MKVToolNix GUI: new feature: implemented adding, changing and
+        removing attachments in existing Matroska files as part of the
+        header editor. Implements #1533.
+
 2015-12-31  Moritz Bunkus  <moritz@bunkus.org>
 
         * Released v8.7.0.