CS4-AE Text on a path mask

Steps:
1. Type some text.
2. With the layer selected, use the pen tool (with RotoBezier turned on to give a rounded curve), create a path.
3. Attach the mask path to the text: Text / Path Options / Path Mask 1 (from the drop down menu)
4. Click the Stopwatch on First Margin, and set where the text will begin to animate on the path.
5. Move the CTI and Set the First Margin to where the animation will end.