DOC What's new for scikit-learn#6288

Sundrique · Jun 14, 2017 · 3f7c400 · 3f7c400
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@@ -31,6 +31,11 @@ Enhancements
      <https://github.com/scikit-learn/scikit-learn/pull/4939>`_) by `Andrea
      Esuli`_.
 
+   - Custom metrics for the :mod:`sklearn.neighbors` binary trees now have
+     fewer constraints: they must take two 1d-arrays and return a float.
+     (`#6288 <https://github.com/scikit-learn/scikit-learn/pull/6288>`_) by
+     `Jake VanderPlas`_.
+
 Bug fixes
 .........