ConfigurableJoint and drives

Hello all

I'm struggling to figure out how ConfigurableJoint angular drives work. I understand how the joint themselves work. I know you're supposed to set the "targetRotation" property, but I'm not sure what that means. I imagined that you would set a value on one of the axis, like X axis rotated -10 degrees from it's original position (where it's anchored). This is how it works in the old ODE engine. But whatever I put into these values, the result is not as expected at all. Been all over the internet looking for an explanation but couldn't find one and the docs, both PhysX's and Unity's, are very scarce in this department.