He made the announcement on Instagram.
The Taoiseach has signed the authorisation for Santa Claus to enter Irish airspace on Christmas Eve.
Simon Harris would usually announce it on the Dáil floor, but this year that wasn't possible.
He's posted a clip on Instagram instead, but has asked children to promise to be good in the run up to the big day.
The Taoiseach explained why the document needs his signature:
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