Not sure exactly what your concern is...All rims tend to be disc brake capable because with disc brakes the brakes do not touch the rim. What would be more important is if you were running a standard caliper brake setup as then it is important to know if the rim is rated for use with a "rim brakes" as some rim models have done away with machined brake tracks and made the sidewalls thinner for those that are not intended for use with rim brakes.

The only disc brake specific concern I can think of about a rim is whether or not the spoke holes have additional offset to help account for the increased dish necessary for the hubs with disc mounts. But I don't even think this issue is all that important.

-j