A new Update is available for Whatsapp, This Update is currently working on Windows Phone, and Android beta testers to improve group features. The function of this update is to allow group owners to add description to their groups, stating its objectives and what it's all about. The group description can be publicly viewed by all members, displayed at the the top of the Group Info Section.
If you're sharing the group invite link to some participants to join, the description will automatic appear so they can know what is done in there before joining and For any new member who got added to a group either by the admin or by using the invite link, a pinned box will be displayed, showing him/her the description of the group. The pinned description will automatically disappear once the user leaves the chat and it won’t appear again.
Exactly like the group name, all participants of the group can also edit the group description, but WhatsApp provided administrators with an option to restrict this function which will be available once the Group super power feature is released.