Apple Motion 4 - Manual (Page 827)

To adjust the text path
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With the Text tool selected, drag a control point to change the shape of the path.
When additional text characters are added to text that is already on a path, the default
path may appear too short. In the following images, the first image shows the original
text placed on a path. The second image shows additional text. Notice that in the second
image with the added text characters, the path is shorter than the text.
Initial text placed on path Additional characters added to original text
To extend a text path
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With the Text tool selected, drag the last control point toward the end of the text.
827 Chapter 13 Creating and Editing Text