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@@ -302,7 +302,9 @@ Writing
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variable values referenced as ``@VAR@`` or ``${VAR}`` contained therein. The
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substitution rules behave the same as the :command:`configure_file` command.
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In order to match :command:`configure_file`'s behavior, generator expressions
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- are not supported for both ``OUTPUT`` and ``CONTENT``.
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+ are not supported for both ``OUTPUT`` and ``CONTENT``, and the output file
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+ is only modified and its timestamp updated if the content is changed or the
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+ file previously didn't exist.
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The arguments are:
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