Spectrum Correction Factors inη,K→3πDecay

It is pointed out that, if one takes account of the structure in $\eta$, $K\to 3\pi$ decay, then the spectrum correction factors are altered substantially from the phase-space factors quoted under the assumption of a constant matrix element. Furthermore, it is noted that the calculation of the spectrum correction factors is not unique without making some theoretical assumptions about the details of the structure of the decays. In particular, the ambiguity of the spectrum correction factors is considered for two models which are consistent with the present data.