age. Clicking this will pop up a dialog box that lets you determine what part of the image should show in the preview; it also allows you to set alt-text for the image, which people can read if they mouse over the text, and which screen-readers (such as for the visually-impaired) can read instead of just saying "embedded image".

Text in the description box has its own character limit; it **does not** count against the character limit for your toot!

## Why should I add a caption to my picture?

In a word: 