Connection migration spec is hard to understand

[huitema]

In section 6.8.5. Privacy Implications of Connection Migration, the base transport spec says:

An endpoint that to break linkability upon changing networks MUST use a previously unused connection ID provided by its peer. Protection of packet numbers ensures that packet numbers cannot be used to correlate connections. Other properties of packets, such as timing and size, might be used to correlate activity, but no explicit correlation can be used to link activity across paths.

"That to break" is a bit awkward. Something must have been left out in the editing process...