If a person forgot to say Yaale V'yovo in Maariv

Nshei Chabad Newsletter / If a person forgot to say Yaale V'yovo in Maariv, the Halocho is as follows: If he reminds himself before he says the word Hashem immediately preceding Hamach'zir Sh'chinosoi L'tzion, he goes back and says Yaale V'yovo. Otherwise, he just continues davvening (Likutei Dinei Uminhogei Rosh Chodesh, Ch. 6, Par. 3).