We consider (3 + 1)-dimensional SU(N )/Z N Yang-Mills theory on a spacetime with a compact spatial direction, and prove the following result: Under a continuous increase of the theta angle θ → θ + 2π, a 't Hooft operator T (γ) associated with a closed spatial curve γ that winds around the compact direction undergoes a monodromy T (γ) → T (γ). The new 't Hooft operator T (γ) transforms under large gauge transformations in the same way as the product T (γ)W (γ), where W (γ) is the Wilson operator associated with the curve γ and the fundamental representation of SU(N ).
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