All you have to do is head into the 'Setting and privacy' section on your Twitter profile. From there go to 'Accessibility' and turn on 'Compose image descriptions.' Once you've done this, you will be able to add a caption to any tweet that contains an image.
It's a simple solution that transforms the website into a platform that literally anyone can use.
In a later tweet, Rob explained shared a video explaining why it is an important tool and why you should make it an option on your account.
This is how captioning works and why it’s important. Would really appreciate people spreading the word and creating… https://t.co/pVItovMDwA