add text when index no provided

fbourgey · fbourgey · commit 436bd54044d4 · 2024-09-18T10:55:35.000-04:00
diff --git a/doc/source/user_guide/dsintro.rst b/doc/source/user_guide/dsintro.rst
@@ -88,7 +88,8 @@ index will be pulled out.
 **From scalar value**
 
 If ``data`` is a scalar value, the value will be repeated to match
-the length of **index**.
+the length of **index**.  If the index is not provided, it defaults
+to ``RangeIndex (0, 1, 2, …, n)``.
 
 .. ipython:: python
 
