See Also
Text display objects are used to show single lines of text on the oneline.
Edit Mode
To add descriptive text to the oneline, select Background > Text in the Individual Insert ribbon group on the Draw ribbon tab, and click the oneline where you would like the text to appear. The Text Options Dialog will open, asking you to enter the desired text string, and the angle at which the text is to appear on the oneline diagram.
To modify an existing text object, position the cursor anywhere on the text and right-click. The New Text Options Dialog will appear, allowing you to edit the text. Use the font option 
of the Formatting ribbon group to control the font and background color of the text object.