diff --git a/docs/machine-learning/preprocessing/imputation-missing-values.md b/docs/machine-learning/preprocessing/imputation-missing-values.md
index 5bbefec..48a5b3a 100644
--- a/docs/machine-learning/preprocessing/imputation-missing-values.md
+++ b/docs/machine-learning/preprocessing/imputation-missing-values.md
@@ -34,7 +34,7 @@ $data = [
 ];
 
 $imputer = new Imputer(null, new MeanStrategy(), Imputer::AXIS_COLUMN);
-$imputer->preprocess($data);
+$imputer->transform($data);
 
 /*
 $data = [