You don’t need a new revision number when you change the description.

1. Confirm you're working in the correct project.
2. Select the menu icon in the upper left corner, then choose Project Setup. Select Drawings.
3. Select Drawings Library.
4. Select the ellipses in the upper right of the drawing in the card view. Select the pencil and paper Edit icon in the grid view.
5. Select Edit.
6. Enter the new description of the drawing.
7. Select Save.