The phrase "additional announcement" is correct and usable in written English.
It can be used when referring to an extra piece of information or news that is being communicated, often following a previous announcement.
Example: "We have an additional announcement regarding the upcoming event that we would like to share with everyone."
Alternatives: "further announcement" or "supplementary announcement".
In an additional announcement that was oddly obscured within the availability announcement, HTC and Rogers announced that they will be pushing a software update to customers within three months which will enable GPS connectivity and Telenav navigation.
Coe's decision to give up that £100,000 pay cheque, as well as the additional announcement that his company CSM would not tender for work with either the IAAF or bidding cities during his presidency, looks certain to pave the way for a paid role as IAAF president.
In an additional announcement Rightster said it has secured the rights to offer live and on demand Australian Football League games outside Australia and New Zealand.
… An additional announcement will be made as soon as the relevant AAAS governance bodies issue a final decision in this case".
"The additional announcement of £13.7m for the extension of the Wi-Fi network in Belfast is meanwhile an excellent technological enhancement for business users".
This disclosure came with an additional announcement that Attorney General John Ashcroft John Ashcroft has recused himself from the criminal investigation of Enron because of contributions he's received from company executives.
"I suspect that we may have additional announcements in the new year".
Additional announcements may be found at http://www.stanford.edu/dept/psychology/colloquium.edu/dept/psychology/colloquium
Mr. Santorum said he would make additional announcements "in the next week or two" about how he would be moving forward.
One person close to the company said that additional announcements of discontinued products could be expected in the next several months.
If you have added the course you are also required to sign up for the course on Blackboard - BME 5010 to receive additional announcements and link to seminars.
