I actually do this quite often. Sometimes it's useful to have a series description, yet Calibre doesn't have a mechanism to store information at the series level other than name and order.
To create a Series info record, I drag and drop an empty text file into Calibre, change the name and metadata, then double-click it to open it in my favorite text editor.
The only drawback is that the Size field doesn't automatically update in the database when you edit a file directly like that. If you don't care about the Size field anyway, it probably doesn't matter.
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