Dear colleagues, As mentioned previously, we would like to make another release of our report in April. This is a friendly reminder of this upcoming release and a final call for updates to any and all of the sections. The previous versions can be found on the linearcollider.org pages http://linearcollider.org/physics-detectors/working-group-detector-rd-liaison The most current (unpublished) pdf version of the document is online on github: https://github.com/linearcollider/DetectorLiaisonReport/releases/download/2020.1/lcDetectorRnD.pdf And the LaTeX code can be found here: https://github.com/linearcollider/DetectorLiaisonReport Updates in LaTeX are preferred, but we will do our best to include updates in any format you send us. Thank you again for your cooperation. Best regards, Maxim and Jan