ROS_PACKAGE_PATH for catkin beginners

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Section 1.2.2 of beginner level tutorial "8.Using rqt_console and roslaunch" says:

*If roscd fails, remember to set the ROS_PACKAGE_PATH variable in your terminal. Then the commands will look like this:

$ export ROS_PACKAGE_PATH=~/<distro>_workspace/sandbox:$ROS_PACKAGE_PATH*

I followed the catkin based tutorial and found out that this doesnt work. I use ros-groovy on Ubuntu 12.10.I tried

export ROS_PACKAGE_PATH=~/catkin_ws/src:$ROS_PACKAGE_PATH

which solved the issue. I guess whats given in the tutorial is based on rosbuild. Perhaps a mention on catkin based command would help beginners.