Is this under the same CC0 terms as the original? If so, would you mind mentioning that in the description? (or in the license field under "More information"... though I'll admit I only just realized that it existed and had to delete a "could you add a license?" comment because of that.)
If not, would you mind naming some other well-known license? (eg. CC-BY)
(You can't be too careful when it comes to assuming licensing terms.)