Update app.py

app.py

@@ -454,7 +454,9 @@ with gr.Blocks(css=STYLES) as demo:
   gr.Markdown(
       "This application is designed for you to collaborate with LLM to co-write stories. It is inspired by [Wordcraft project](https://wordcraft-writers-workshop.appspot.com/) from Google's PAIR and Magenta teams. "
       "This application built on [Gradio](https://www.gradio.app), and the underlying text generation is powered by [Hugging Face Inference API](https://huggingface.co/inference-api). The text generation model might"
-      "be changed over time, but [meta-llama/Llama-2-70b-chat-hf](https://huggingface.co/meta-llama/Llama-2-70b-chat-hf) is selected for now.",
+      "be changed over time, but [meta-llama/Llama-2-70b-chat-hf](https://huggingface.co/meta-llama/Llama-2-70b-chat-hf) is selected for now. On the `exporting` tab, you can generate cover art for your story. You can "
+      "design your own prompt to generate the cover art, or you can let the LLaMA2 to generate one for you. Currently, the quantized Stable Diffusion model `nota-ai/bk-sdm-small` by [Nota AI](https://www.nota.ai/) is "
+      "used.",
       elem_classes=['center', 'small-big'])
 
   with gr.Row():
@@ -517,6 +519,10 @@ with gr.Blocks(css=STYLES) as demo:
           regen_btn = gr.Button("regenerate", elem_classes=['control-label-font', 'control-button'])
 
       with gr.Tab("Exporting"):
+        gr.Markdown("generate cover art with [`nota-ai/bk-sdm-small`](https://huggingface.co/nota-ai/bk-sdm-small) model. "
+                    "design your own prompt in the textbox below, or just hit 'generate prompt for cover art` button. LLaMA2 "
+                    "model will suggest a prompt for you based on your story.")
+          
         cover_art = gr.Image(interactive=False, elem_classes=['no-label-image'])
         gen_cover_art_prompt = gr.Textbox(lines=5, max_lines=5, elem_classes=['no-label'])
         # toggle between "generate prompt for cover art" and "generate cover art"
@@ -524,8 +530,8 @@ with gr.Blocks(css=STYLES) as demo:
         gen_pdf_btn = gr.Button("export as PDF", elem_classes=['control-label-font', 'control-button'])
         pdf_file = gr.File(visible=False)
 
-  progress_bar = gr.Textbox(elem_classes=['no-label'])    
-    
+  progress_bar = gr.Textbox(elem_classes=['no-label'])
+
   gen_pdf_btn.click(
       lambda t, e, c: generate_pdf(t, e, c),
       inputs=[title, editor, cover_art],