Board Thread:Boruto Discussions/@comment-31700161-20170610121821/@comment-1512913-20170611152851

We already do have more than 3 canonical doujutsu though.
 * We have the progenitor of both Sharingan and Rinnegan, the Rinne Sharingan
 * We have Sharingan
 * We have Rinnegan
 * We have Byakugan
 * We have barely explained Tenseigan
 * We have possibly new doujutsu, Boruto's eye

Then we have 'maybe canon' Ketsuryuugan as well.