Help: Document CUDA_STANDARD and related properties

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diff --git a/Help/prop_tgt/CUDA_EXTENSIONS.rst b/Help/prop_tgt/CUDA_EXTENSIONS.rst
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+CUDA_EXTENSIONS
+---------------
+
+Boolean specifying whether compiler specific extensions are requested.
+
+This property specifies whether compiler specific extensions should be
+used.  For some compilers, this results in adding a flag such
+as ``-std=gnu++11`` instead of ``-std=c++11`` to the compile line.  This
+property is ``ON`` by default. The basic CUDA/C++ standard level is
+controlled by the :prop_tgt:`CUDA_STANDARD` target property.
+
+See the :manual:`cmake-compile-features(7)` manual for information on
+compile features and a list of supported compilers.
+
+This property is initialized by the value of
+the :variable:`CMAKE_CUDA_EXTENSIONS` variable if it is set when a target
+is created.
diff --git a/Help/prop_tgt/CUDA_STANDARD.rst b/Help/prop_tgt/CUDA_STANDARD.rst
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+CUDA_STANDARD
+-------------
+
+The CUDA/C++ standard whose features are requested to build this target.
+
+This property specifies the CUDA/C++ standard whose features are requested
+to build this target.  For some compilers, this results in adding a
+flag such as ``-std=gnu++11`` to the compile line.
+
+Supported values are ``98``, ``11``.
+
+If the value requested does not result in a compile flag being added for
+the compiler in use, a previous standard flag will be added instead.  This
+means that using:
+
+.. code-block:: cmake
+
+  set_property(TARGET tgt PROPERTY CUDA_STANDARD 11)
+
+with a compiler which does not support ``-std=gnu++11`` or an equivalent
+flag will not result in an error or warning, but will instead add the
+``-std=gnu++98`` flag if supported.  This "decay" behavior may be controlled
+with the :prop_tgt:`CUDA_STANDARD_REQUIRED` target property.
+Additionally, the :prop_tgt:`CUDA_EXTENSIONS` target property may be used to
+control whether compiler-specific extensions are enabled on a per-target basis.
+
+See the :manual:`cmake-compile-features(7)` manual for information on
+compile features and a list of supported compilers.
+
+This property is initialized by the value of
+the :variable:`CMAKE_CUDA_STANDARD` variable if it is set when a target
+is created.
diff --git a/Help/prop_tgt/CUDA_STANDARD_REQUIRED.rst b/Help/prop_tgt/CUDA_STANDARD_REQUIRED.rst
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+CUDA_STANDARD_REQUIRED
+----------------------
+
+Boolean describing whether the value of :prop_tgt:`CUDA_STANDARD` is a requirement.
+
+If this property is set to ``ON``, then the value of the
+:prop_tgt:`CUDA_STANDARD` target property is treated as a requirement.  If this
+property is ``OFF`` or unset, the :prop_tgt:`CUDA_STANDARD` target property is
+treated as optional and may "decay" to a previous standard if the requested is
+not available.  For compilers that have no notion of a standard level, such as
+MSVC, this has no effect.
+
+See the :manual:`cmake-compile-features(7)` manual for information on
+compile features and a list of supported compilers.
+
+This property is initialized by the value of
+the :variable:`CMAKE_CUDA_STANDARD_REQUIRED` variable if it is set when a
+target is created.