You need not send it in a file folder. Simply type a brief note saying that this is an updated list for their file. This not only provides your outside contacts with current information, it also affords a good opportunity to keep the section's name before these audiences. A press release should contain the name and telephone number of a contact person, when the story should be released, and, of course, the information itself. Writing a press release is simple.
Subsequent paragraphs add supplemental information.
Keep in mind that you want to communicate with general public. Try to explain technical terms in easily understood language, and most of all, try to give some perspective on how the technology will affect daily life. If possible, keep your press release to a single, double-spaced page. Press releases should never be handwritten. The media should receive the follow-up no more than 24 hours after the event.