It might be helpful, if this notification showed some information or came with a link to more information.
I am sure, I can find the information somewhere but just being able to click might make it (even) easier for people to make themselves useful.
What (also) might be helpful information here:
- a list of all tags
- a list of tags I have been active in
- a list of tags where I have been active in with no description
- a list of requested tags (if this exists in the area of or near my expertise)
- guidelines for creating tags and editing tag descriptions
Update: The suggested link in the comment takes care of point 5.