[PATCH 2/3] docs/mm/damon/design: difference between watermarks and nr_snapshots

[Liew Rui Yan <aethernet65535@gmail.com>]

Explain the difference between nr_snapshots reaches max_nr_snapshots and
watermarks.

Signed-off-by: Liew Rui Yan <aethernet65535@gmail.com>
---
 Documentation/mm/damon/design.rst | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/Documentation/mm/damon/design.rst b/Documentation/mm/damon/design.rst
index 939298f2a9b9..1fcf0b8c044b 100644
--- a/Documentation/mm/damon/design.rst
+++ b/Documentation/mm/damon/design.rst
@@ -872,7 +872,8 @@ the action to the region will fail.
 
 Unlike normal stats, ``max_nr_snapshots`` is set by users.  If it is set as
 non-zero and ``nr_snapshots`` be same to or greater than ``nr_snapshots``, the
-scheme is deactivated.
+scheme is deactivated. Note that, unlike watermarks, even if a scheme's
+``nr_snapshots`` reaches ``max_nr_snapshots``, monitoring will not stop.
 
 To know how user-space can read the stats via :ref:`DAMON sysfs interface
 <sysfs_interface>`, refer to :ref:s`stats <sysfs_stats>` part of the
-- 
2.55.0