You can add or change your WhatsApp group description and here’s how you can do that on Android:
Open WhatsApp Messenger app.
Find your group chat and then long press it.
Hit the Overflow Menu (three vertical dots) at the top and then tap “Group info” option.
Now, you can see “Add group description” option. Tap on it.
Enter the description as per your wish. Keep in mind that this description will be visible to group participants and people invited to the group.
Hit “OK” at the bottom.
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:
Long press the group chat. Hit the Overflow Menu (three vertical dots) at the top and then tap “Group info.”
Tap on “Group settings.” Now, tap on the “Edit group info” option.
Choose “Only admins.” Tap “OK.”
From now on, only admins can add or change group subject, icon, and description.