This document gives additional information for the observer about the LWS instrument, its operations and sensitivities. It includes the latest sensitivity figures, and an updated section on calculating observing times. This document supplements and in some places superceeds the LWS Observers Manual. Especially Chapters 5 and 6 of the LWS observers manual are affected. Sections 5 and 6 of this document provide the updated information for these chapters. The information in this document is based on the experience of the LWS consortium using the instrument in orbit. The LWS consortium members have used this information to update their Guaranteed Time observations.