What is the difference between mock and mock_model in RSpec

I've recently came across different tutorials, where people use both mock and mock_model functions.

In RSpec tutorial for controllers they use the mock_model function, but right in the documentation of RSpec, there is only mock function, but no mock_model

I tried to run some tests myself, and I didn't find any real difference, since everything was ok when I used either of those two functions, so is there any difference at all?