doc headers

lib/volume/obv/Obv.md

@@ -1,5 +1,22 @@
 # OBV: On Balance Volume
 
+| Property         | Value                            |
+| ---------------- | -------------------------------- |
+| **Category**     | Volume                        |
+| **Inputs**       | OHLCV bar (TBar)                          |
+| **Parameters**   | None                      |
+| **Outputs**      | Single series (OBV)                       |
+| **Output range** | Unbounded                     |
+| **Warmup**       | `> 2` bars                          |
+
+### TL;DR
+
+- On Balance Volume distills the relationship between price and volume into a single cumulative indicator.
+- No configurable parameters; computation is stateless per bar.
+- Output range: Unbounded.
+- Requires `> 2` bars of warmup before first valid output (IsHot = true).
+- Validated against TA-Lib, Skender, and Tulip reference implementations where available.
+
 > "Volume is the fuel that drives price." — Joseph Granville
 
 On Balance Volume distills the relationship between price and volume into a single cumulative indicator. The premise is elegantly simple: volume flows into a security when it closes higher, and flows out when it closes lower. OBV tracks this flow as a running total, creating a momentum indicator that often leads price movements.
@@ -180,4 +197,4 @@ The slope of OBV indicates buying/selling intensity:
 - Murphy, J. (1999). *Technical Analysis of the Financial Markets*. New York Institute of Finance.
 - Investopedia. "On-Balance Volume (OBV)." [Definition](https://www.investopedia.com/terms/o/onbalancevolume.asp)
 - StockCharts. "On Balance Volume (OBV)." [Technical Indicators](https://school.stockcharts.com/doku.php?id=technical_indicators:on_balance_volume_obv)
-- TradingView. "PineScript ta.obv()." [Reference](https://www.tradingview.com/pine-script-reference/v5/#fun_ta{dot}obv)
+- TradingView. "PineScript ta.obv()." [Reference](https://www.tradingview.com/pine-script-reference/v5/#fun_ta{dot}obv)