Direct answer
Objectives follow journal display order. Some depend on your choices; follow the active objective in the game.
Result
In one of the now-unused bedrooms of Kaer Morhen Geralt found a note left by Berengar, a witcher who had once been his companion and colleague. The note indicated Berengar had been working on forging an exceptional sword called Tor'haerne. The note was sparing in its details, so Geralt decided to ask Vesemir if he knew something more on the subject.
