Readme: Mention context manager.

Blosc · Dec 8, 2023 · e048e2f · e048e2f
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diff --git a/README.rst b/README.rst
@@ -23,7 +23,10 @@ After that, optimization will be attempted for any slicing of a dataset (of the
 
 .. _hdf5plugin: https://github.com/silx-kit/hdf5plugin
 
-You may globally disable the optimization after importing ``b2h5py`` by calling ``b2h5py.unpatch_dataset_class()``, and enable it again with ``b2h5py.patch_dataset_class()``. Even if the module is imported and the ``Dataset`` class is patched, you may still force-disable the optimization by setting ``BLOSC2_FILTER=1`` in the environment.
+You may globally disable the optimization after importing ``b2h5py`` by calling ``b2h5py.unpatch_dataset_class()``, and enable it again with ``b2h5py.patch_dataset_class()``.  You may
+also perform this patching temporarily using ``patching_dataset_class()`` to get a context manager.
+
+Even if the module is imported and the ``Dataset`` class is patched, you may still force-disable the optimization by setting ``BLOSC2_FILTER=1`` in the environment.
 
 Building
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