Undocumented Wunderlist update user endpoint

Question

There appears to be an endpoint on the Wunderlist API for updating the wunderlist user (at https://a.wunderlist.com/api/v1/user) which does not appear in the official docs

User information can be updated by sending a PUT request to it, e.g. :

curl \
    -H "X-Access-Token: $WL_ACCESS_TOKEN" \
    -H "X-Client-ID: $WL_CLIENT_ID" \
    -H "Content-Type: application/json" \
    -XPUT -d '{"revision":1234,"name":"some-name"}' \
    https://a.wunderlist.com/api/v1/user

Assuming the data is valid, this returns with HTTP 200.

Is this endpoint supported?