@@ -264,6 +264,7 @@ def save(self, clip, filename_prefix, prompt=None, extra_pnginfo=None):
 
         metadata = {}
         if not args.disable_metadata:
+            metadata["format"] = "pt"
             metadata["prompt"] = prompt_info
             if extra_pnginfo is not None:
                 for x in extra_pnginfo: