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-rw-r--r--doc/source/reference/ufuncs.rst8
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diff --git a/doc/source/reference/ufuncs.rst b/doc/source/reference/ufuncs.rst
index 0e7da347e..295d52ef4 100644
--- a/doc/source/reference/ufuncs.rst
+++ b/doc/source/reference/ufuncs.rst
@@ -292,6 +292,14 @@ advanced usage and will not typically be used.
The first output can provided as either a positional or a keyword parameter.
+*where*
+
+ .. versionadded:: 1.7
+
+ Accepts a boolean array which is broadcast together with the operands.
+ Values of True indicate to calculate the ufunc at that position, values
+ of False indicate to leave the value in the output alone.
+
*casting*
.. versionadded:: 1.6