Minor wordsmithing.
diff --git a/Doc/library/collections.rst b/Doc/library/collections.rst
index cde114c..1cb80e4 100644
--- a/Doc/library/collections.rst
+++ b/Doc/library/collections.rst
@@ -536,8 +536,7 @@
return self._make(_map(kwds.get, ('x', 'y'), self))
The subclasses shown above set ``__slots__`` to an empty tuple. This keeps
-the named tuples from having per-instance dictionaries, so they will
-continue to be lightweight and require no more memory than regular tuples.
+keep memory requirements low by preventing the creation of instance dictionaries.
Subclassing is not useful for adding new, stored fields. Instead, simply
create a new named tuple type from the :attr:`_fields` attribute::