Attaching user to comment

How would I add a user name along with the form input? The user name
is defined in application.rb as @current_user

Below works 100% w/ adding the comment body/time but I wasnt sure how
to add the user part

albums_controller.rb

def comment
@albums = Albums.find(params[:id])
@albumscomment =
Albums.find(params[:id]).comments.create(params[:comment])
    if request.post? and @albumscomment.save
    flash[:notice] = 'comment submission succeeded!'
    redirect_to :action => 'show', :permalink => @albums.permalink
    end
end