title: How can I add text annotation in Bokeh?
body: <p>I'm looking for Matplotlib type <a href="http://matplotlib.org/1.4.0/users/annotations_intro.html">1</a> text annotation in Bokeh, but I couldn't find it in the their user guide <a href="http://bokeh.pydata.org/en/latest/docs/user_guide.html">2</a> or in the references.</p>