Correct. Just make sure you backup before you do the upgrade. Be sure you are backing up photos and stuff too or they will not restore. Also, music and apps are not backed up but instead are "sync'd". Do a full sync and make sure that what is on your phone is sync'd with your iTunes install on your Mac/PC.
For what it's worth, there are also two packages that you may want to get and use beforehand. PKGBackup and AppBackup. PKGBackup will backup all your jailbroken settings and apps including your springboard settings. AppBackup will backup all of the settings for your AppStore apps so you don't lose them. That way if you jailbreak again you can technically restore your old setups assuming that they are compatible with iOS6.
Good luck.