DAMON usage document provides a list of available DAMON interfaces with
brief introduction at the beginning of the doc.  The list is missing
DAMON modules for special purposes, while it is one of the major
suggested interfaces.  Add an item for those to the list.

Signed-off-by: SeongJae Park <sj@kernel.org>
---
 Documentation/admin-guide/mm/damon/usage.rst | 5 +++++
 Documentation/mm/damon/design.rst            | 2 ++
 2 files changed, 7 insertions(+)

diff --git a/Documentation/admin-guide/mm/damon/usage.rst b/Documentation/admin-guide/mm/damon/usage.rst
index 7da4c002cb39..bfaee977c37c 100644
--- a/Documentation/admin-guide/mm/damon/usage.rst
+++ b/Documentation/admin-guide/mm/damon/usage.rst
@@ -6,6 +6,11 @@ Detailed Usages
 
 DAMON provides below interfaces for different users.
 
+- *Special-purpose DAMON modules.*
+  :ref:`This <damon_modules_special_purpose>` is for people who are building,
+  distributing, and/or administrating the kernel with special-purpose DAMON
+  usages.  Using this, users can use DAMON's major features for the given
+  purposes in build, boot, or runtime in simple ways.
 - *DAMON user space tool.*
   `This <https://github.com/damonitor/damo>`_ is for privileged people such as
   system administrators who want a just-working human-friendly interface.
diff --git a/Documentation/mm/damon/design.rst b/Documentation/mm/damon/design.rst
index c10a3dea3aa8..dd64f5d7f319 100644
--- a/Documentation/mm/damon/design.rst
+++ b/Documentation/mm/damon/design.rst
@@ -817,6 +817,8 @@ available.  Please refer to the ABI :ref:`doc <sysfs_interface>` for details of
 the interfaces.
 
 
+.. _damon_modules_special_purpose:
+
 Special-Purpose Access-aware Kernel Modules
 -------------------------------------------
 
-- 
2.47.3