  Lin and Liu evaluate the nucleon expectation value of the non gauge-invariant
canonical quark momentum operator on a lattice, and obtain zero. They conclude
that my argument that, despite the non gauge-invariance of the operator, its
physical matrix elements \emph{are} gauge-invariant, cannot be correct. I show
that their result has no bearing on the question of gauge-invariance, and also
point to an amusing lattice paradox.
