  A small spheroid settling in a quiescent fluid experiences an inertial torque
that aligns it so that it settles with its broad side first. Here we show that
an active particle experiences such a torque too, as it settles in a fluid at
rest. For a spherical squirmer, the torque is $\boldsymbol{T}^\prime =
-{\tfrac{9}{8}} m_f (\boldsymbol{v}_s^{(0)} \wedge \boldsymbol{v}_g^{(0)})$
where $\boldsymbol{v}_s^{(0)}$ is the swimming velocity,
$\boldsymbol{v}_g^{(0)}$ is the settling velocity in the Stokes approximation,
and $m_f$ is the equivalent fluid mass. This torque aligns the swimming
direction against gravity: swimming up is stable, swimming down is unstable.
