better documentation

README.rst

@@ -17,7 +17,7 @@ Usage
 ``get`` retrieves data, ``update`` transforms it based on its form, and ``set``
 transforms it by simply resetting. Transformations can be applied in place or
 on a copy. The default is in place, because copying is expensive. If you want a
-copy of the data, set the keyword argument ``in_place`` to ``True``.
+copy of the data, set the keyword argument ``in_place`` to ``False``.
 
 It uses a query "language" not unlike CSS, albeit much, much simpler. The only
 two entities in this "language" are IDs—denoted by ``#``—and Classes—denoted by