The example does not execute

With the inclusion of the app.run we now are able to execute the program, it would be great if we'd have even more detailed docs available for the examples

examples/blueprintexample/blueprintexample.py

@@ -5,3 +5,6 @@ app = Flask(__name__)
 app.register_blueprint(simple_page)
 # Blueprint can be registered many times
 app.register_blueprint(simple_page, url_prefix='/pages')
+
+if __name__=='__main__':
+  app.run()