matplotlib external documentation

How do I add matplotlib external docs in pycharm?

so far tried
http://matplotlib.org/api/{module.name}_api.html#matplotlib.{module.name}.{element.name}
and
http://matplotlib.org/api/{class.name}_api.html#matplotlib.{class.name}.{function.name}

none of those works.. pycharm doesn't show the same kind of verbose docs as it does for numpy when I view external docs for functions and stuff....