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-rw-r--r--Help/policy/CMP0149.rst7
1 files changed, 7 insertions, 0 deletions
diff --git a/Help/policy/CMP0149.rst b/Help/policy/CMP0149.rst
index 714eeaf..a84149f 100644
--- a/Help/policy/CMP0149.rst
+++ b/Help/policy/CMP0149.rst
@@ -35,6 +35,13 @@ This policy provides compatibility for projects, toolchain files, and
build scripts that have not been ported away from using
:variable:`CMAKE_SYSTEM_VERSION` to specify an exact SDK version.
+.. note::
+
+ This policy must be set before the first :command:`project` or
+ :command:`enable_language` command invocation at the top of the
+ project. That is when :ref:`Visual Studio Generators` select a
+ Windows SDK.
+
The ``OLD`` behavior for this policy is to use the exact value of
:variable:`CMAKE_SYSTEM_VERSION` if possible. The ``NEW`` behavior
for this policy is to ignore it.