Should combined Assistant files include a preamble/context?

We would like our press releases to be available to an Assistant (among other things). Because of the 20 file limit, I was thinking of combining all press releases together in one file. Given that, would it help if I add a preamble or formatting to the combined file? Something like:

“This file contains all of the company’s press releases. The title of a single press release will look like this: “Title: XXXXXX” and the Body which will be multiple lines long will be on the next line after a Title and will look like this: “Body: XXXX”. The press releases will be about a variety of topics… …”

Ok should I just mash all the press releases together and not give any additional hints about the format?