Downloading Sources of Required Libraries with Scala and SBT

This one is mostly a reminder to myself, as I keep forgetting what needs to be done, to download the sources of required Scala libraries into Eclipse.

Assumption One: You are already using SBT to build your project.

Assumption Two: You are already using sbteclipse to create eclipse project files.

And then: Add EclipseKeys.withSource := true to your build.sbt (more about Settings)