add desc

app.py

@@ -7,6 +7,8 @@ description = """
 Gradio demo for combining <a href="https://github.com/facebookresearch/segment-anything">Segment-Anything (SAM)</a>
 <a href="https://huggingface.co/docs/transformers/main/en/model_doc/owlvit">OWL-ViT</a>.
 \n\nYou can use OWL-ViT to query boxes with text descriptions of any object, then SAM will segment anything in the boxes.
+
+Note: In this demo, I only get the one box per class to demonstrate, you can modify the code to get multiple boxes beyond a threshold.
 """
 demo = gr.Interface(
     query_image,