Add explanation text for tags by library

app.py

@@ -251,7 +251,10 @@ with gr.Blocks() as demo:
             with gr.Accordion("View case sensitive tag pairs", open=False):
                 gr.Dataframe(display_case_sensitive_duplicate_tags())
     with gr.Tab("Tags frequencies by library"):
-        gr.Markdown("Tags by library")
+        gr.Markdown(
+            "The 🤗 hub hosts models from a wide range of machine learning libraries. These libraries use tags in "
+            "slightly different ways. The table below gives a breakdown of the most frequent tags for each library."
+        )
         library_choice = gr.Dropdown(choices=libraries, label="select library")
         df = gr.Dataframe()
         library_choice.change(