diff --git a/CLAUDE.md b/CLAUDE.md
index 6d1d21d..25bb618 100644
--- a/CLAUDE.md
+++ b/CLAUDE.md
@@ -352,7 +352,12 @@ revert without reading why. When in doubt, walk the
 - LLM: `https://hermes.ai.unturf.com/v1` (Hermes-3 Llama-3.1-8B-FP8-
   Dynamic on vLLM, 82K ctx, no auth). `uncloseai.com` is marketing
   only. Override via `--endpoint` or `ARBORIST_LLM_ENDPOINT`.
-- Wikipedia dumps: `https://dumps.wikimedia.org/archive/2003/2003-05-16/en/`.
+- Wikipedia dumps: two corpora available — the 2003-05-16 cur snapshot
+  (`https://dumps.wikimedia.org/archive/2003/2003-05-16/en/`) and a
+  **2010** snapshot. **The 2010 corpus is what is currently loaded** in
+  `~/.arborist/shards` (866K docs/shard; contains post-2003 articles like
+  Barack Obama / YouTube — the discriminator). Fabrication-bait fixtures
+  (`qa_questions_stale_map`) target post-**2010** events.
   `robots.txt` returned 404 → no rules.
 
 ### Budget discipline — Hermes / Qwen first, Opus deferred
diff --git a/docs/energy-cogs-benchmark.md b/docs/energy-cogs-benchmark.md
index cc670bd..f12bc0b 100644
--- a/docs/energy-cogs-benchmark.md
+++ b/docs/energy-cogs-benchmark.md
@@ -30,8 +30,11 @@ Two rigs:
 
 Common to both: arborist `query()` pipeline, **STOCK V.1** frozen config
 (`claim_lattice` hash `036a4c79…`, `quote` `5b6ca4c5…`,
-`bench/stock_v1.py`); orchestrator drives the endpoint, power sampled on
+`bench/stock_v1.py`); **Wikipedia 2010 corpus** (~866K docs/shard,
+`~/.arborist/shards`); orchestrator drives the endpoint, power sampled on
 the box; **$0.33/kWh** (the only non-measured input, `--price-per-kwh`).
+(Fabrication-bait questions target post-2010 events, so the substrate
+correctly abstains where bare models answer from parametric memory.)
 
 **Two arms, same model (the substrate-delta design):**
 - **solo** — question only, neutral system prompt, no retrieval, no verifier.