Permanently adding workspace to ROS environment

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I am following this tutorial to create a new ROS package. In step 4 we build the catkin workspace and sourc the setup file and once this is done I can do a roscd beginner_tutorials from anywhere and it will take me to ~/catkin_ws/src/beginner_tutorials brilliant! ...until I close the terminal window and open a new one. Now roscd <TAB> <TAB> doesn't show "beginner_tutorials" as an option. If I re-source my setup file i.e. do a . ~/catkin_ws/devel/setup.bash everything works again.

Do I need to source my setup file everytime I open a new terminal window or is there some way to permanently add it to my ROS environment?

I have this source /opt/ros/kinetic/setup.bash at the end of my .bashrc file.