One should say the berachah "lehitatef betzitzit" with a shva under the beit, not a patach [i.e. betzitzit and not batzitzit], and it is necessary to direct intention during the berachah over the tallit gadol/large tallit to exempt the tallit katan/small tallit that is on him that he did not remove during the night, because there is a svara/rationale that one might need to say a berakhah on the tallit katan in the morning, but because of safek berakhot lehakel [if doubtful of a berakhah, be lenient] we do not say it. And I wrote in my holy sefer Mekabtziel that if one makes that kavanah then it applies to the other, and it is not necessary to handle the tallit katan at the time of the berakhah also according to the opinion of Maran z"l, and therefore since forgetfulness happens with people and they wander and do not have kavanah sometimes, therefore it is proper to accustom oneself to add the nusach/phrasing "leshem yichud kusha brikh hu u'shekhinteh.." mentioned above, as well as these words, "Hareinu muhcan levarekh al atifat hatalit ketikun chazal/I declare myself ready to say the berakhah on wrapping in a tallit as our Sages ordained," and "hareini mechavin liftor bavrakhah zu gam hatalit katan shealai/I declare that I intend to exempt with this berakhah also the tallit katan that is on me."