You're missing the 'do' at this end of this line. Also, the describe block is usually followed by the individual "it" blocks for each test. 
In any case, I could not get your spec file to run on my machine. After adding the 'do' in the line above and working through some other errors I ran the spec separately. This time the individual spec ran, but failed. I don't know if it's the way you configured things or something having to do with my local environment. I'm assuming all your tests ran and passed for you? If you'd like my feedback and you want to explain what you did, I can give it another shot. This is the last message I got:

1) Making a Comment After Logging In creates a comment
     Failure/Error: @user = FactoryGirl.create(:user)
     ActiveRecord::RecordInvalid:
       Validation failed: Email has already been taken
     # ./spec/features/comment_spec.rb:7:in `block (2 levels) in <top (required)>'