Dear Editor,rnI am coauthor of the paper entitled Balance control of a humanoid robot based on the reaction null space method by Akinori Nishio, Kentaro Takahashi and Dragomir N. Nenchev, published on pages 1996 - 2001 in the Proceeding of the 2006 IEEE/RSJ Intational Conference on Intelligent Robots and Systems held 9-15 October 2006 in Beijing, China.