The phrase "a comprehensive announcement" is correct and usable in written English.
It can be used when referring to an announcement that covers all necessary details or information thoroughly.
Example: "The company issued a comprehensive announcement regarding the new policy changes that will take effect next month."
Alternatives: "a detailed announcement" or "an extensive announcement".
There's still no release date, but with FCC approval and other tablets knocking at consumers' doors, I think we can expect a more comprehensive announcement from T-Mobile within, say, two months.
When he met with television reporters ahead of his State of the Union message last year, for instance, Mr. Trump suggested that he would announce a comprehensive immigration deal, an announcement that did not materialize later that night.
The current vaccination rounds are part of a comprehensive response to the announcement, in October 2013, that wild poliovirus of Pakistani origin had found its way to Syria.
As I mentioned in an earlier blog post, one component of the Meyer Schapiro Collection includes a comprehensive series of exhibition announcements he collected spanning from the 1920 through the 1990s.
He developed a working relationship with Toronto Mayor David Miller soon after his appointment, and was present for the announcement of a comprehensive new waterfront strategy in June 2006.
The Army, in its own announcement, called it a "comprehensive operation against foreign and local terrorists" who "had been disrupting our national life in all its dimensions".
The company's announcement says mMedia provides "a comprehensive dashboard" where advertisers can control their bids, targeting, and creative.
If this wasn't enough, shortly after Clinton's announcement, the Democratic Party followed suit, including a comprehensive democracy reform plan in its official platform.
For several months prior to the announcement, I worked with my president to develop a comprehensive approach to retaining employees through what was scheduled to be a transition of nine months from the time of the public announcement.
Public health experts welcomed the announcement, including the need to address the problem in a comprehensive fashion.
