diff --git a/ultralytics/cfg/default.yaml b/ultralytics/cfg/default.yaml
index 2ef1f4284f..9f6eb51a42 100644
--- a/ultralytics/cfg/default.yaml
+++ b/ultralytics/cfg/default.yaml
@@ -83,7 +83,7 @@ int8: False # (bool) CoreML/TF INT8 quantization
 dynamic: False # (bool) ONNX/TF/TensorRT: dynamic axes
 simplify: True # (bool) ONNX: simplify model using `onnxslim`
 opset: # (int, optional) ONNX: opset version
-workspace: 4 # (int) TensorRT: workspace size (GB)
+workspace: None # (float, optional) TensorRT: workspace size (GiB), `None` will let TensorRT auto-allocate memory
 nms: False # (bool) CoreML: add NMS
 
 # Hyperparameters ------------------------------------------------------------------------------------------------------