By considering the sensitivity-robustness problem in analytical redundancy-based fault detection schemes, Manquez, H. J. and C. P. Diduch (1992). Sensitivity of failure detection using generalized observers. Automatica, 28, 837-840, proposed a new General Observer to overcome the limits on achievable sensitivity imposed by the structure of classical full-order observers and partial state observers. It is shown here that this General Observer can be found to be equivalent to the partial state observer using the generalized Bezout identity. Two corrected representations of equations (20) and (23) in Manquez and Diduch’s paper are also provided.