How can we make freeradius logs logout actions?

[Mark jensen]

freeRADIUS version is 1.0.4, and we use IEEE802.1X to authenticate users 

This is a part of my radius.log file:

Wed Jun 11 11:14:36 2014 : Auth: Login OK: [Mark/<via Auth-Type = EAP>] (from client private-network-1 port 0 via TLS tunnel)
Wed Jun 11 11:14:36 2014 : Auth: Login OK: [Mark/<via Auth-Type = EAP>] (from client private-network-1 port 5 cli F0-4D-A2-B2-34-16)
Wed Jun 11 11:20:57 2014 : Auth: Login OK: [Mike/<via Auth-Type = EAP>] (from client private-network-1 port 0 via TLS tunnel)
Wed Jun 11 11:20:57 2014 : Auth: Login OK: [Mike/<via Auth-Type = EAP>] (from client private-network-1 port 11 cli 00-26-38-C0-BA-37)

as we see above radius logs the login actions, but when a user logout, radius doesn't log anything 

Can we make radius logs the logout actions too,what the configurations should I change to do this?