Shul announcements during davening

Hi,

We permit announcements at certain points during davening for the sake of the davening itself (ie announcement of Yaaleh v'Yavo before the amidah of Maariv on Rosh Chodesh, as mentioned in Aruch haShulchan Orach Chaim 422:1). This permission applies even for the sake of others' davening, despite the fact that the person making the announcement does not need the reminder.

(Rav Moshe Feinstein, Igrot Moshe Orach Chaim 4:16)

Have a great day,
Mordechai