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-rw-r--r--Help/command/export.rst9
1 files changed, 7 insertions, 2 deletions
diff --git a/Help/command/export.rst b/Help/command/export.rst
index b255ee8..ffd60e1 100644
--- a/Help/command/export.rst
+++ b/Help/command/export.rst
@@ -62,8 +62,13 @@ registry that this command creates works only in conjunction with a
package configuration file (``<PackageName>Config.cmake``) that works with the
build tree. In some cases, for example for packaging and for system
wide installations, it is not desirable to write the user package
-registry. If the :variable:`CMAKE_EXPORT_NO_PACKAGE_REGISTRY` variable
-is enabled, the ``export(PACKAGE)`` command will do nothing.
+registry.
+
+By default the ``export(PACKAGE)`` command does nothing (see policy
+:policy:`CMP0090`) because populating the user package registry has effects
+outside the source and build trees. Set the
+:variable:`CMAKE_EXPORT_PACKAGE_REGISTRY` variable to add build directories to
+the CMake user package registry.
.. code-block:: cmake