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Abstract Transposable elements in prokaryotes are found in many forms and therefore a robust nomenclature system is needed in order to allow researchers to describe and search for them in publications and databases. Here we provide an update on The Transposon Registry which allocates numbers to any prokaryotic transposable element. Additionally, we present the completion of registry records for all transposons assigned Tn numbers from Tn1 onwards where sequence data or publications exist.