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diff --git a/Help/manual/ctest.1.rst b/Help/manual/ctest.1.rst
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@@ -589,6 +589,11 @@ Configuration settings to specify the version control tool include:
* `CTest Script`_ variable: :variable:`CTEST_GIT_COMMAND`
* :module:`CTest` module variable: ``GITCOMMAND``
+ The source tree is updated by ``git fetch`` followed by
+ ``git reset --hard`` to the ``FETCH_HEAD``. The result is the same
+ as ``git pull`` except that any local moficiations are overwritten.
+ Use ``GITUpdateCustom`` to specify a different approach.
+
``GITInitSubmodules``
If set, CTest will update the repository's submodules before updating.