diff --git a/auto_transformers.py b/auto_transformers.py
index 496f989..1ce8b7d 100644
--- a/auto_transformers.py
+++ b/auto_transformers.py
@@ -229,6 +229,10 @@ class AutoTransformers(NNOperator):
         else:
             return ['pytorch']
 
+    @property
+    def supported_formats(self):
+        return ['onnx']
+
     @staticmethod
     def supported_model_names(format: str = None):
         full_list = [