Clarify filenames

README.md

@@ -59,7 +59,7 @@ icon = ":books:"
 url_path = "my_books" # You can override the default url path for a page
 ```
 
-Example with sections:
+Example with sections, `.stremalit/pages_sections.toml`:
 
 ```toml
 [[pages]]
@@ -91,6 +91,9 @@ from st_pages import add_page_title, get_nav_from_toml
 
 st.set_page_config(layout="wide")
 
+# If you want to use the no-sections version, this
+# defaults to looking in .streamlit/pages.toml, so you can
+# just call `get_nav_from_toml()`
 nav = get_nav_from_toml(".streamlit/pages_sections.toml")
 
 st.logo("logo.png")