  We present fermi liquid expressions for the low temperature behavior of the
superfluid stiffness, explain why they differ from those suggested recently by
Lee and Wen, and discuss their applicability to data on high-$T_c$
superconductors. We find that a consistent description requires a strong,
doping dependent anisotropy, which affects states near the zone corners much
more strongly than those near the zone diagonals.
