2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/103653A criterion for comonadicity of the extension-of- scalars functor associated to an extension of (not necessarily commutative) rings is given. As an application of this criterion, some known results on the comonadicity of such functors are obtained.Quantum AlgebraCategory Theory18C15, 13B99; 18D10, 16D20, 16D90text