Add placeholder text to ArXiv IDs Textbox

app.py

@@ -122,7 +122,9 @@ with gr.Blocks() as demo:
         gr.LoginButton(size="sm")
         gr.LogoutButton(size="sm")
     author_name = gr.Textbox(label="Author name", interactive=True)
-    positive_arxiv_ids = gr.Textbox("1910.01108", label="ArXiv IDs", interactive=True)
+    positive_arxiv_ids = gr.Textbox(
+        "e.g. 1910.01108", label="ArXiv IDs", interactive=True
+    )
     btn = gr.Button("Get papers")
     btn.click(get_papers, [author_name, positive_arxiv_ids], gr.Markdown())