matplotlib
diff --git a/‎doc/api/next_api_changes/behavior/20054-JMK.rst
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+Axes used to make colorbar now wrapped
+======================================
+
+The axes used to place a colorbar is now wrapped by a new parent class
+(``ColorbarAxes``) when the colorbar is created::
+
+    cb = fig.colorbar(im, cax=cax)
+
+This means that ``cb.ax`` is no longer the same object as ``cax``. However, 
+we map all the methods from ``cb.ax`` onto ``cax`` so ``cax`` should remain 
+functionally the same as ``cb.ax``.  
+
+Colorbar lines no longer clipped
+================================
+
+If a colorbar has lines added to it (e.g. for contour lines), these will
+no longer be clipped.  This is an improvement for lines on the edge of
+the colorbar, but could lead to lines off the colorbar if the limits of
+the colorbar are changed.