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README.md

@@ -42,7 +42,8 @@ risk needs a 5-month EWMA burn-in, proxies and diagnostics 8 months.
 
 Partitions are Hive-style (`month=YYYY-MM/part.parquet`) and hold **daily**
 point-in-time rows — a typical exposures partition is ~40,800 rows
-(~1,777 tickers x ~23 trading days) x 122 columns.
+(~1,777 tickers x ~23 trading days) x 122 columns, plus the `month`
+partition key when read through `hf://`.
 
 Also at the tree root: `factor_returns.parquet` (full daily history),
 `exposures_latest.parquet`, `specific_risk_latest.parquet`,