Siman 120

(17.) In the year 5570 [1809/10] he traveled to Uman. In the year 5571 [1810/11] he passed away there. And all the events there are in every journey and every place where he dwelt — some of them have already been recorded elsewhere, and the majority has been forgotten. Beyond this there is far more that we do not know at all, for certainly no person knows the inner meaning of his holy journeys. (וְעַיֵּן הוֹסָפוֹת סִי' קי)