Sound Library - ON what does "description" filter work ?

Hi all,

I'm trying out to use the sound-library in DR15 Studio.

Humm ...
I can't find out, which description the "description" Filter uses.

1. It is not possible to set or edit any description or keywording inside of the sound library
2. the filter does obviously NOT use any of the descritpion-field embedded in mp3 files.

Please, can anybody explain me how to use the description filter to organize my sound library for DR15 ?

I'm on DR15.1.1 Studio on Windows 10 Pro

Thanks a lot
Peter