diff --git a/Doc/tutorial/datastructures.rst b/Doc/tutorial/datastructures.rst
index 0e5891a..916da4a 100644
--- a/Doc/tutorial/datastructures.rst
+++ b/Doc/tutorial/datastructures.rst
@@ -107,7 +107,7 @@
 
 You might have noticed that methods like ``insert``, ``remove`` or ``sort`` that
 only modify the list have no return value printed -- they return the default
-``None``. [1]_  This is a design principle for all mutable data structures in
+``None``.  This is a design principle for all mutable data structures in
 Python.