Import reference to object - Shortcut

I forgot what is the shortcut for importing reference to object

Let's say I have two files:
polls/models.py

class Poll(db.Model):
   ...


polls/views.py

...
poll = Poll()
...

Poll will be underlined with red line, but when I place cursor somewhere inside 'Poll' string and click <shortcut_I_need> PyCharm will search for definition and import it for me.

I think it was smth like ALT + N.

Thanks