diff --git a/README.md b/README.md
index a5bf719..761ff47 100644
--- a/README.md
+++ b/README.md
@@ -64,18 +64,49 @@ The default quotas of all the auction houses for non trade goods items are:
 
 The sum of the percentage for these categories must always be 100, or otherwise the defaults values will be used and the modifications will not be accepted.
 
-## Per-item listing count override (optional)
-
-The `mod_auctionhousebot_countOverride` table (`item`, `targetCount`) lets the bot list a
-per-item quantity that mirrors a real economy instead of the uniform `DuplicatesCount`.
-When an item has a row, `targetCount` is used as the maximum number of that item the bot
-lists, **replacing** the global `DuplicatesCount` for that item.
-
-Note: because the override replaces `DuplicatesCount` for that item, an override applies
-even when `DuplicatesCount` is `0` (globally "unlimited") - overridden items are then capped
-at their `targetCount`. Items with no row keep the global behaviour, and an empty/absent
-table is a no-op. The shipped data is derived from ChromieCraft auction liquidity
-(`targetCount = min(observed_listings, 50)`).
+## Merkerhood customizations
+
+This fork adds four behaviours on top of the stock buyer/seller bot, so the auction
+house reads like a real ChromieCraft economy instead of quality-multiplier defaults.
+Design detail lives in `docs/superpowers/specs/`; the Python tooling that generates the
+data tables is in `tools/price-backfill/` (stdlib only, no dependencies).
+
+### ChromieCraft base prices
+
+`mod_auctionhousebot_priceOverride` (`item`, `avgPrice`, `minPrice`) is the base-price
+source. The bot prioritises listing items that have an override and falls back to the
+fixed defaults otherwise. The table is generated by `tools/price-backfill/backfill.py`
+from ChromieCraft's live auction data, scraped from wowauctions.net's JSON endpoint keyed
+by item id. Price changes that swing far from the previous overrides land in a
+`reports/deviations-*.csv` worklist for manual review. See the tool README to regenerate.
+
+### Reagent-cost derivation
+
+Craftable items that never traded on ChromieCraft (so have no market price) get a price
+derived from their reagents. `tools/price-backfill/derive.py` parses the recipe graph from
+`Spell.dbc` (committed as `recipes.json`), prices each item recursively from its reagents'
+ChromieCraft prices, falls back to vendor sell price where a reagent is unpriced, and
+applies a crafting margin. Derived rows are merged (add-only) into the same priceOverride
+table.
+
+### Per-item listing count override
+
+`mod_auctionhousebot_countOverride` (`item`, `targetCount`) lets the bot list a per-item
+quantity that mirrors real liquidity instead of the uniform `DuplicatesCount`. When an item
+has a row, `targetCount` is the maximum of that item the bot lists, **replacing** the global
+`DuplicatesCount` for it (so an override applies even when `DuplicatesCount` is `0`,
+"unlimited"). The cap is per auction house. Items with no row keep the global behaviour, and
+an empty/absent table is a no-op. The shipped data is
+`targetCount = min(observed ChromieCraft listings, 50)`.
+
+### Reasonable stack sizes
+
+Glyphs, recipes, quest items, containers, keys, and cut gems (socketable,
+`GemProperties != 0`) always list as quantity 1, regardless of the item's stackable value.
+Other stackables use weighted human breakpoints `{1, 5, 10, 20, full}` clamped to the
+per-quality maximum, never a random 7 or 13. This is the default when
+`AuctionHouseBot.DivisibleStacks = 0`; setting it to `1` keeps the older divisible-multiples
+mode.
 
 ## Credits