ax.annotate in 1.4.2 behave different from 1.3.1

With the sample code below, in matplotlib 1.3.1, the Text are placed at top
left,
which is like the docs said,
"/If a ‘points’ or ‘pixels’ option is specified, values will be added to the
bottom-left and if negative, values will be subtracted from the top-right/".
http://matplotlib.org/api/text_api.html
<http://matplotlib.org/api/text_api.html#matplotlib.text.Annotation>
but in matplotlib 1.4.2, the Text showed at bottom.
Is it a bug here?

#sample code:
import matplotlib.pyplot as plt
fig = plt.figure(1, figsize=(8,5))
ax=fig.add_subplot(1,1,1)
ax.annotate('somthing', (8, -8),
            xycoords='axes points', va="top", ha='left',
            size=10, color='r')
plt.show()

···

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