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diff --git a/docs/users_guide/intro.rst b/docs/users_guide/intro.rst
index 281c04a211..677f4625b4 100644
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+++ b/docs/users_guide/intro.rst
@@ -175,3 +175,6 @@ numbering GHC versions:
The version number of your copy of GHC can be found by invoking ``ghc``
with the ``--version`` flag (see :ref:`options-help`).
+The compiler version can be tested within compiled code with the
+``MIN_VERSION_GLASGOW_HASKELL`` CPP macro (defined only when
+:ghc-flag:`-XCPP` is used). See :ref:`standard-cpp-macros` for details.