message: Add a clarifying comment
diff: @@ -392,6 +392,10 @@ def cuda_rdc_library(name, hdrs = None, copts = None, linkstatic = True, **kwarg
  merged = name + "_merged"
  _merge_archive(
  name = merged,
  +
  + # TODO(b/166662245): We're deliberately not using `pruned` here.
  + # Pruning __nv_relfatbin also seems to prune out the PTX shipped with
  + # NCCL.
  srcs = [lib, dlink],
  )
  