diff --git a/backtesting/filter/__init__.py b/backtesting/filter/__init__.py
index 17eb721..6fd6e80 100644
--- a/backtesting/filter/__init__.py
+++ b/backtesting/filter/__init__.py
@@ -1 +1,2 @@
+from .backtest_filter import BacktestFilter
 from .volatility_regime_filter import VolatilityRegimeFilter
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