1000C Upgrade from 5.2.10 to 5.6.6

Hello,

       We are upgrading our Fortinet 1000C from code 5.2.10 to 5.6.6 and as I'm looking at the release notes on 5.4.5 (attached, page 14 under Upgrading to FortiOS 5.6.0) I see the following verbiage.

"If you have configured IPsec in version 5.4.5, after upgrading to 5.6.0, you must reconfigure all IPsec phase1 psksecret settings before you can establish an IPsec tunnel.

My question is, the first part of the statement talks about having configured IPSec in 5.4.5 then you'll have to reconfig the PSK.  What if the tunnels had been configured in 5.2, do I still need to reconfig the PSK?  Thanks,