  The purpose of this Comment is to point out that the results presented in the
appendix of M. Mondragon and M. Montesinos, J. Math. Phys. 47, 022301 (2006)
provides a generic method so as to deal with cases as those of Section 6 of R.
Cartas-Fuentevilla, A. Escalante-Hern\'andez, and J. Berra-Montiel, Int. J.
Mod. Phys. A 26, 3013 (2011). The results already reported are: the canonical
analysis, the transformations generated by the constraints, and the analysis of
the reducibility of the constraints for SO(3,1) and SO(4) four-dimensional BF
theory coupled or not to a cosmological constant. But such results are generic
and hold actually for any Lie algebra having a non-degenerate inner product
invariant under the action of the gauge group.
