Spline Documentation?

Searching on Spline in Unreal Docs… I am unable to find any substantial docs on using splines / spline tool in the Editor.
(For things like roads etc…) I am aware of the recent video, but where are the text docs ???

Got link?

Make sure you’re using V4.6 or higher, so you can edit the spline tangent points. Also I haven’t seen it documented anywhere, but you can right click on spline points and get a couple cool options.