Add alt text to SmartArt graphics
Add alt text to images, such as pictures, clip art, and screenshots, so that screen readers can read the text to describe the image to users who can’t see the image.
- Right-click a SmartArt graphic.
- Select Format Object > Shape Options > Layout & Properties.
- Select Alt Text.
- Type a description and a title.
TIP: Include the most important information in the first line, and be as concise as possible.
For more hints and guidelines for writing good alt text, visit the page Writing for Accessibility: Alt Tags and Long Descriptions.
Source: Microsoft