After search giant Google and social media sites Facebook and Twitter, it’s Yahoo’s move to swear to alarm its users should they believe their reports are assaulted by hackers working on behalf of authorities (state-sponsored celebrities).
Based on The Guardian, Yahoo’s chief information security officer Bob Lord told about this change in a site.

“We’ll supply these special notifications in order our users can take proper measures to secure their accounts and apparatus in light of these sophisticated assaults. Our tellings supply targeted users with particular activities they are able to take to help make sure their Yahoo accounts are secure and safe,”Lord included.
Twitter and Facebook had made a similar statement in October, December.