Update app.py

app.py

@@ -213,7 +213,11 @@ def build_demo(embed_mode, concurrency_count=1):
 
         with gr.Row():
             with gr.Column(scale=3):
-                imagebox = gr.Image(type="numpy", label="Input Screenshot")
+                imagebox = gr.Image(type="numpy", label="Input Screenshot", placeholder="""#Challenge ShowUI with your hardest screenshots!
+                For Windows: Win + Shift + S,
+                For macOS: Command + Shoft + 3,
+                Then upload / Paste from clipboard 🤗
+                """)
                 textbox = gr.Textbox(
                     show_label=True,
                     placeholder="Enter a query (e.g., 'Click Nahant')",