The IRAM Technical Report 228/95 ``Frequency Switching at the 30m Telescope'' (Thum et al.) is now available under Mosaic and can be retrieved following the links in the IRAM Grenoble home page http://iram.fr/iram.html. As reported in Newsletter Nr. 22 (July 1995), frequency switching can be done with three receivers (3mm, 230G1, 2mm) simultaneously. Thus, one limitation mentioned in the Technical Report (Chapter 6.1, page 24) does not exist any more.