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Clarify partial fills in backtesting docs #2481

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Mar 29, 2025
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Clarify partial fills in backtesting docs #2481

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2 changes: 1 addition & 1 deletion docs/concepts/backtesting.md
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Expand Up @@ -364,7 +364,7 @@ When using less granular data, the same behaviors apply as L1:

The `FillModel` has certain limitations to keep in mind:

- Partial fills are not simulated - orders either fill completely or not at all.
- **Partial fills are supported** with L2/L3 order book data - when there is no longer any size available in the order book, no more fills will be generated and the order will remain in a partially filled state. This accurately simulates real market conditions where not enough liquidity is available at the desired price levels.
- With L1 data, slippage is limited to a fixed 1-tick, at which entire order's quantity is filled.

:::note
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