Update DAMON design document for the write access sample results
filtering.

Signed-off-by: SeongJae Park <sj@kernel.org>
---
 Documentation/mm/damon/design.rst | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/Documentation/mm/damon/design.rst b/Documentation/mm/damon/design.rst
index 4c6d83263a7b..b194bf4a6519 100644
--- a/Documentation/mm/damon/design.rst
+++ b/Documentation/mm/damon/design.rst
@@ -148,7 +148,7 @@ the page protection in a way similar to that of NUMA balancing hinting faults.
 Then the page fault handler reports the faults happend by the installed page
 protection to DAMON core layer.  Compared to the accessed-bit based one, this
 approach gives more information to DAMON, such as the access-generated
-CPU/threads.
+CPU/threads and whether it was for writing or reading.
 
 ``paddr`` uses :ref:`accessed-bit based check
 <damon_design_pte_accessed_bit_access_check>` by default, and users can change
@@ -317,6 +317,8 @@ Below ``type`` of access sampling results filter are currently supported.
 - threads
     - Whether the sampled access was generated by a thread that having a thread
       (task) id that exist in a given array of ids.
+- write
+    - Whether the sampled access was for writing.
 
 
 .. _damon_design_age_tracking:
-- 
2.47.3