docs: @Override
    public boolean adjustEntry(MkMaxEntry entry, DBID routingObjectID, double parentDistance, AbstractMTree<O, MkMaxTreeNode<O>, MkMaxEntry, ?> mTree) {
      super.adjustEntry(entry, routingObjectID, parentDistance, mTree);
      // adjust knn distance
      entry.setKnnDistance(kNNDistance());
      return true; // TODO: improve
    }