HI,

> Is there any doc saying, there is only one kind of announcement?

It's used for several things:
- adding new committers, PMC members and chairs
- for releases
- conferences or other important events

for release it has a singular meaning. I don't think it appropriate in this 
case and it may confuse users in thinking it's a release when it is not. 
However I'm not a member of your PMC so that is for them to decide.

Thanks,
Justin

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