to be a better way to go.
@command{tar} doesn't access @var{snapshot-file} when
-@value{op-create} or @value{op-list} are specified, but the
+@value{op-extract} or @value{op-list} are specified, but the
@value{op-listed-incremental} option must still be given. A
placeholder @var{snapshot-file} can be specified, e.g.,
@file{/dev/null}.