Update API changes

dstansby · dstansby · commit 7947acca84de · 2017-11-14T10:42:31.000Z
diff --git a/doc/api/api_changes/2017-10-24-DS.rst b/doc/api/api_changes/2017-10-24-DS.rst
@@ -2,4 +2,9 @@
 -------------------------------------------
 
 `StemContainer` objects now store a `LineCollection` object instead of a list
-of `Line2D` objects for stem lines plotted using `ax.stem`.
+of `Line2D` objects for stem lines plotted using `ax.stem`. This gives a very
+large performance boost to displaying and moving `ax.stem` plots.
+
+Line segments can be extracted from the `LineCollection` using
+`LineCollection.get_segements()`. See the `LineCollection` documentation for
+other methods to retrieve the collection properties.
