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In a recent experiment (Phys. Rev. Lett. {\bf 87}, 036903 (2001)), Spielmanet al observed a linearly dispersing collective mode in quantum Hallferromagnet. While it qualitatively agrees with the Goldstone mode dispersionat small wave vector, the experimental mode velocity is slower than thatcalculated by previous theories by a factor about 0.55. A better agreement withthe experimental data may possibly be achieved by taking the subband Landaulevel coupling into account due to the finiteness of the layer thickness. Anovel coupling of quantum fluctuation to the tunneling is briefly discussed.Comment: 4 pages; published versio

Effect of subband Landau level coupling to the linearly dispersing collective mode in a quantum Hall ferromagnet