A Comment on a Fivebrane Term in Superalgebra

We review our recent discussion of fivebrane central terms that appear in the space-time superalgebra in D=10 provided that the space-time supercharges are taken in non-canonical pictures. We correct the mistake contained in the original version of the earlier paper hep-th/9703008 which suggested that the naive picture-changing of the superalgebra could give rise to the non-perturbative five-form term. The relation between picture-changing and p-brane central terms appears to be much more subtle, as is pointed out in the revised version of the mentioned paper.