After completing the main story line quest The Waters of Life, the Lone Wanderer will gain access to the Citadel, the Brotherhood of Steel's main headquarters in the Capital Wasteland. Inside the library in the A Ring area, Scribe Jameson can be found. She is the keeper of the scrolls at the Citadel, which means it's her responsibility to record the actions of the Brothers, including their deaths. After speaking to her, she will tell the Wanderer to bring her any Brotherhood of Steel holotags they may find on their journeys.