Update app.py

app.py

@@ -35,6 +35,7 @@ click `submit`.
 st.image("Screencastfrom23-09-24151531-ezgif.com-optimize.gif")
 
 st.subheader('Set slide numbers')
+st.markdown("Specify the range of slide numbers you want to generate.")
 
 range_values = st.slider(
     'Select a range',