- were added/removed or filenames changed). This is usually used in
- conjunction with the ``--uuid`` argument to
- :any:`notmuch-search(1)` to find messages that have changed since
- an earlier query.
+ were added/removed or filenames changed). Negative revisions are
+ interpreted relative to the most recent database revision (see
+ :option:`count --lastmod`). This is usually used in conjunction
+ with the ``--uuid`` argument to :any:`notmuch-search(1)` to find
+ messages that have changed since an earlier query.