added a missing comment
added a missing comment

[git-p4: depot-paths = "//sw/gpgpu/nvbio/internal/": change = 18479956]

kimrutherford/nvbio,NVlabs/nvbio,NVlabs/nvbio,NVlabs/nvbio,kimrutherford/nvbio,NVlabs/nvbio,kimrutherford/nvbio,kimrutherford/nvbio