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-rw-r--r--Help/variable/CMAKE_CXX_SCAN_FOR_MODULES.rst5
1 files changed, 5 insertions, 0 deletions
diff --git a/Help/variable/CMAKE_CXX_SCAN_FOR_MODULES.rst b/Help/variable/CMAKE_CXX_SCAN_FOR_MODULES.rst
index 0d6c636..a40bf75 100644
--- a/Help/variable/CMAKE_CXX_SCAN_FOR_MODULES.rst
+++ b/Help/variable/CMAKE_CXX_SCAN_FOR_MODULES.rst
@@ -8,3 +8,8 @@ Whether to scan C++ source files for module dependencies.
This variable is used to initialize the :prop_tgt:`CXX_SCAN_FOR_MODULES`
property on all the targets. See that target property for additional
information.
+
+.. note ::
+
+ This setting is meaningful only when experimental support for C++ modules
+ has been enabled by the ``CMAKE_EXPERIMENTAL_CXX_MODULE_CMAKE_API`` gate.