tl;dr - Here's a direct link to the moved API Docs: https://docs.unity3d.com/Packages/com.unity.timeline@1.0/api/index.html 2019.1 is releasing soon and some of you may have noticed that the API Docs are seemingly nowhere to be found. Timeline is gradually moving to become a package and that means our documentation now resides with the rest of the packages documentation. Since discoverability is fairly low at the present, here's a quick guide on how to find it. 1. Go to https://docs.unity3d.com/Manual and make sure you are looking at the 2019.1b version 2. At the bottom of the table of contents, you will find a link to the packages documentation 3. From there, you will find links to the Timeline docs (and to the docs of any other package you are interested in) 4. From there select Scripting API