Add note that the property is not created during unmarshalling.
Add note that the property is not created during unmarshalling.

permazen/permazen,tempbottle/jsimpledb,permazen/permazen,archiecobbs/jsimpledb,tempbottle/jsimpledb,tempbottle/jsimpledb,permazen/permazen,archiecobbs/jsimpledb,archiecobbs/jsimpledb