371. More About the Bracha Mei’ein Shalosh
51:9 We mention Shabbos, yom tov and Rosh Chodesh as applicable in the bracha mei’ein shalosh but if one forgot to do so, he does not repeat the bracha.
51:10 In 44:6, we discussed ways in which one must act during bentching. For example, one must sit to bentch and not recite it walking around. All the rules there also apply to the bracha mei’ein shalosh.