OpenCV works but PyCharm can’t find referances

I’ve just starting OpenCV tutorial. But previously I’ve installed it. The modules work properly, but PyCharm doesn’t display any documentation of them and display a warning message:

Cannot find reference ‘imread’ in ‘__init__.py’

Note 1: I’m using Python 3.5.2 and version of the OpenCV is 3.2 (I checked it from python terminal)

Note 2: Python terminal (Inside the PyCharm IDE) displays doc.