You can add or change your WhatsApp group description and here's how you can do that on Android:
That's it. All done.
Note: By default, any group participant can add or change group description.
If you want to allow the admins only to add or change group description, then follow these steps:
From now on, only admins can add or change group subject, icon, and description.
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How to Add or Change WhatsApp Group Description on Android