Heisenbergs position-measurement--momentum-disturbance relation is derivable from the uncertainty relation $sigma(q)sigma(p) geq hbar/2$ only for the case when the particle is initially in a momentum eigenstate. Here I derive a new measurement--disturbance relation which applies when the particle is prepared in a twin-slit superposition and the measurement can determine at which slit the particle is present. The relation is $d times Delta p geq 2hbar/pi$, where $d$ is the slit separation and $Delta p=D_{M}(P_{f},P_{i})$ is the Monge distance between the initial $P_{i}(p)$ and final $P_{f}(p)$ momentum distributions.
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