How to allow Users to use @ in the comments?

Question

I am having problems getting the @ person look-up function to work for everyone in the comments.  It seems like the Jira-developers group works, but I don't want to give everyone developer access.  I have looked through the permissions, but don't see anything specific for doing this.  Any ideas on what combination of permissions will let this work?

Renee Setta · Accepted Answer

Also, I did find the Global permissions at:

Settings> Security > Global Permissions > Browse Users

However I don't see anyway to add a group or person to this permission.  I also don't see a way to add this permission to a Permission Scheme.  It does just have the Jira-Developers listed here.