dataset card

README.md

@@ -102,8 +102,9 @@ issues in v1.0").
 
 **Permitted inputs.** Systems may use only the `text` fields. Ids, dates, `header`, `subject`, `raw_text`,
 `source_url`, `answers` and the queries' `answer` field are forbidden: answer ids reuse the question id (that rule
-alone scores MRR@10 0.989) and a 0–180-day date window lifts BM25 from 0.547 to 0.760. Dates may be used only for the
-as-of filters of the citation tasks.
+alone scores MRR@10 0.989) and a 0–180-day date window lifts BM25 from 0.547 to 0.760. At test time, dates may be used
+only for the as-of filters of the citation tasks; training may use training-split metadata (two post-hoc recipes
+select negatives by date).
 
 **Baseline protocol caveat.** Fine-tuning on the training split with BM25 hard negatives mined across the whole
 archive (the pre-registered protocol) hurts (MRR@10 0.424 ± 0.008 over 3 seeds vs 0.490 zero-shot). Post-hoc