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diff --git a/Help/variable/CMAKE_GENERATOR_TOOLSET.rst b/Help/variable/CMAKE_GENERATOR_TOOLSET.rst
index 53ad2f3..45f2d32 100644
--- a/Help/variable/CMAKE_GENERATOR_TOOLSET.rst
+++ b/Help/variable/CMAKE_GENERATOR_TOOLSET.rst
@@ -63,3 +63,27 @@ Supported pairs are:
Specify an alternative ``VCTargetsPath`` value for Visual Studio
project files. This allows use of VS platform extension configuration
files (``.props`` and ``.targets``) that are not installed with VS.
+
+Visual Studio Toolset Customization
+^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+**These are unstable interfaces with no compatibility guarantees**
+because they hook into undocumented internal CMake implementation details.
+Institutions may use these to internally maintain support for non-public
+Visual Studio platforms and toolsets, but must accept responsibility to
+make updates as changes are made to CMake.
+
+Additional ``key=value`` pairs are available:
+
+``customFlagTableDir=<path>``
+ .. versionadded:: 3.21
+
+ Specify the absolute path to a directory from which to load custom
+ flag tables stored as JSON documents with file names of the form
+ ``<platform>_<toolset>_<tool>.json`` or ``<platform>_<tool>.json``,
+ where ``<platform>`` is the :variable:`CMAKE_VS_PLATFORM_NAME`,
+ ``<toolset>`` is the :variable:`CMAKE_VS_PLATFORM_TOOLSET`,
+ and ``<tool>`` is the tool for which the flag table is meant.
+ **This naming pattern is an internal CMake implementation detail.**
+ The ``<tool>`` names are undocumented. The format of the ``.json``
+ flag table files is undocumented.