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-rw-r--r--doc/neps/missing-data.rst4
1 files changed, 4 insertions, 0 deletions
diff --git a/doc/neps/missing-data.rst b/doc/neps/missing-data.rst
index 478d019a5..de00cbb74 100644
--- a/doc/neps/missing-data.rst
+++ b/doc/neps/missing-data.rst
@@ -738,6 +738,10 @@ NPY_ITER_WRITEMASKED
to know the mask ahead of time, and copying everything into
the buffer will never destroy data.
+ The code using the iterator should only write to values which
+ are not masked by the mask specified, otherwise the result will
+ be different depending on whether buffering is enabled or not.
+
NPY_ITER_ARRAYMASK
Indicates that this array is a boolean mask to use when copying
any WRITEMASKED argument from a buffer back to the array. There