You might think you don’t really need bilingual employees on staff, especially if most, if not all, of your business is done within the English-speaking community. But no less than five studies say otherwise, points out a report in Entrepreneur, and some of the benefits might surprise you.

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Not only can bilingual employees be valuable in serving a broader customer base, but speaking another language can keep employees in better mental health. Bilingualism benefits employees mentally, says the report, and increases their productivity in the workplace — both good things for their employers — and it can also delay dementia, according to the American Academy of Neurology.