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If you create an xml file using a text editor (Notepad will suffice), that says
...
<Simple>
<Name>DESCRIPTION</Name>
<String>(whatever)</String>
</Simple>
<Simple>
<Name>COMMENT</Name>
<String>(whatever)</String>
</Simple>
and just specify it, on Mkvmerge GUI, when creating an mkv file, then a player like MPC shows (whatever) as "Description" below the video itself (Ctrl+3) while playing the resulted mkv file.
(Or if you mean subtitles, you can of course embed them as you like.)
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