Add description of new ufuncs.

Add some comments about nan handling in amax/amin.

1 files changed, 25 insertions, 4 deletions

diff --git a/doc/release/1.3.0-notes.rst b/doc/release/1.3.0-notes.rst
index ed893ef97..d4a908a2e 100644
--- a/doc/release/1.3.0-notes.rst
+++ b/doc/release/1.3.0-notes.rst
@@ -38,10 +38,31 @@ Formatting issues
 
 TODO
 
-Nan handling in max/min/sort
-~~~~~~~~~~~~~~~~~~~~~~~~~~~~
-
-TODO
+Nan handling in max/min
+~~~~~~~~~~~~~~~~~~~~~~~
+
+The maximum/minimum ufuncs now reliably propagate nans. If one of the
+arguments is a nan, then nan is retured. This affects np.min/np.max, amin/amax
+and the array methods max/min. New ufuncs fmax and fmin have been added to deal
+with non-propagating nans.
+
+New ufuncs
+~~~~~~~~~~
+
+#. fmax - same as maximum for integer types and non-nan floats. Returns the
+   non-nan argument if one argument is nan and returns nan if both arguments
+   are nan.
+#. fmin - same as minimum for integer types and non-nan floats. Returns the
+   non-nan argument if one argument is nan and returns nan if both arguments
+   are nan.
+#. deg2rad - converts degrees to radians, same as the radians ufunc.
+#. rad2deg - converts radians to degrees, same as the degrees ufunc.
+#. log2 - base 2 logarithm.
+#. exp2 - base 2 exponential.
+#. logaddexp - add numbers stored as logarithms and return the logarithm
+   of the result.
+#. logaddexp2 - add numbers stored as base 2 logarithms and return the base 2
+   logarithm of the result result.
 
 Masked arrays
 ~~~~~~~~~~~~~