diff --git a/models.py b/models.py
index a08cd822..565cecda 100755
--- a/models.py
+++ b/models.py
@@ -317,6 +317,7 @@ class Darknet(nn.Module):
 
         ONNX_export = False
         if ONNX_export:
+            # Produce a single-layer *.onnx model (upsample ops not working in PyTorch 1.0 export yet)
             output = output[0].squeeze().transpose(0, 1)  # first layer reshaped to 85 x 507
             output[5:] = torch.nn.functional.softmax(torch.sigmoid(output[5:]) * output[4:5], dim=0)  # SSD-like conf
             return output[5:], output[:4]  # ONNX scores, boxes