How to add CF-RAY header to your apache logs?

Where do i need to add this code? i m using apache2

LogFormat “%h %l %u %t “%r” %>s %b “%{Referer}i” “%{User-agent}i” %{CF-Ray}i” cf_custom
CustomLog log/access_log cf_custom

You add this to your apache2 config in the correct places. You can find more information with: