Setting up blog at blog.example.com (httpd.conf issue)

Question

I installed WordPress on my dedicated server, but had a bit of trouble getting httpd.conf to play nice...

I tried adding the following lines:

<VirtualHost *:80>
DocumentRoot /var/www/html/blog
ServerName blog.example.com

</VirtualHost>

And set the file permissions as:

root@server [/var/www/html]# chown -R apache:apache blog/
root@server [/var/www/html]# chmod g+w blog/

But I think I did something wrong in the httpd.conf because the entire site stopped functioning.