How to get an offset of a RaycastHit?

Hi Unity,

I'm working with RayCasting in an Editor Window script.

I'm translating where a user clicks on the Scene View to a WorldPoint like so:

         Ray worldRay = HandleUtility.GUIPointToWorldRay(e.mousePosition);
         Debug.DrawRay(worldRay.origin, worldRay.direction * 20, Color.yellow);
         RaycastHit hitInfo;

         if (Physics.Raycast(worldRay, out hitInfo, 20))
         {
             Debug.Log(hitInfo.point);
         }

Doing so will give me the world coordinate of where my ray was intersected, which is great. However, I need to know how to calculate an offset, and get a point in the ray line 1 world unit prior to the intersection. I tried searching the Forums on this one, but just do not know the right words to describe what I'm looking for.

Anyone know how?

Thanks