It basically says that the FBI never notified the FISA court about British court documents from April 2017. Christopher Steele had found himself in court not long after the dossier went public, because it wrongfully implicated certain people/businesses. Part of his defense was the dossier wasn't fully verified, also that Fusion GPS betrayed him by making it public. Based on a Strzok email, the FBI knew about Steele being a defendant by April 26, 2017 at the latest. Based on other documents, Comey had a meeting with OGC about Steele's courtroom proceedings on May 1, 2017 and it was decided, "did not change our assessment, no need to update FISA."  This is a problem, because the final FISA renewal was in June of 2017 and the court wasn't informed about any of this.