Minor nits

app.py

@@ -117,6 +117,9 @@ def run(
 
 with gr.Blocks(css="style.css") as demo:
     gr.Markdown(DESCRIPTION)
+    gr.Markdown("This is the demo for [ViTMatte](https://github.com/hustvl/ViTMatte), an image matting application. You can matte any subject in a given image.")
+    gr.Markdown("If you wish to replace background of the image, simply select the checkbox and drag and drop your background image.")
+    gr.Markdown("You can draw your own foreground mask and unknown (border) mask using the canvas.")
     gr.DuplicateButton(
         value="Duplicate Space for private use",
         elem_id="duplicate-button",
@@ -141,7 +144,7 @@ with gr.Blocks(css="style.css") as demo:
                             height=500,
                         )
                         unknown_mask = gr.Image(
-                            label="Unkown",
+                            label="Unknown",
                             tool="sketch",
                             type="numpy",
                             brush_color="green",