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diff --git a/doc/neps/nep-0018-array-function-protocol.rst b/doc/neps/nep-0018-array-function-protocol.rst
index 75f4132a4..430199aa0 100644
--- a/doc/neps/nep-0018-array-function-protocol.rst
+++ b/doc/neps/nep-0018-array-function-protocol.rst
@@ -95,6 +95,15 @@ A prototype implementation can be found in
of NumPy functions for non-NumPy arrays. See "Non-goals" below for more
details.
+.. note::
+
+ Dispatch with the ``__array_function__`` protocol has been implemented on
+ NumPy's master branch but is not yet enabled by default. In NumPy 1.16,
+ you will need to set the environment variable
+ ``NUMPY_EXPERIMENTAL_ARRAY_FUNCTION=1`` before importing NumPy to test
+ NumPy function overrides. We anticipate the protocol will be enabled by
+ default in NumPy 1.17.
+
The interface
~~~~~~~~~~~~~