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In this short note, we prove that $v(-\epsilon)=-v(\epsilon)$. Here,$v(\epsilon)$ is the speed of a one-dimensional random walk in a dynamic\emph{reversible} random environment, that jumps to the right (resp. to theleft) with probability $1/2+\epsilon$ (resp. $1/2-\epsilon$) if it stands on anoccupied site, and vice-versa on an empty site. We work in any setting where$v(\epsilon), v(-\epsilon)$ are well-defined, i.e. a weak LLN holds. The proofrelies on a simple coupling argument that holds only in the discrete setting.

A note on the antisymmetry in the speed of a random walk in reversible dynamic random environment