Confusing UI text

I completely misunderstood this text:

Lock the hierarchy:
[ ] The hierarchy cannot be changed (locked)

I thought this meant that the view would not allow nested (hierarchical) ordering. What it does is disabling the draggable interface altogether, which made me spend hours of troubleshooting and debugging. I would suggest something like:

Lock the order:
[ ] The order and hierarchy cannot be changed (locked)

Thanks!