[CentOS] CentOS 6: file and directory permissions

Hi,
 
I fear I am too stupid:
 
I find nowhere the explanation of the dot in file permissions like:
 
-rw-r--r--. 1 root root  457 Aug  4 17:27 config
 
I have searched in forums, Red Hat deployment guide, storage administration guide etc  
 
Thank you for help in advance.
 
Best regards
Helmut
 
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.centos.org/pipermail/centos/attachments/20110913/64882b82/attachment.html>