From 5650bebc2fa19db4572b6e445c8b28ee9e733732 Mon Sep 17 00:00:00 2001
From: Michael Hirsch <scivision@users.noreply.gitlab.kitware.com>
Date: Mon, 5 Jul 2021 10:50:56 -0400
Subject: [PATCH] Help: Note CXX_STANDARD values added vs. CMake version

---
 Help/prop_tgt/CXX_STANDARD.rst | 26 +++++++++++++++++++++++++-
 1 file changed, 25 insertions(+), 1 deletion(-)

diff --git a/Help/prop_tgt/CXX_STANDARD.rst b/Help/prop_tgt/CXX_STANDARD.rst
index be0dab565c..b10d201738 100644
--- a/Help/prop_tgt/CXX_STANDARD.rst
+++ b/Help/prop_tgt/CXX_STANDARD.rst
@@ -11,7 +11,31 @@ flag such as ``-std=gnu++11`` to the compile line.  For compilers that
 have no notion of a standard level, such as Microsoft Visual C++ before
 2015 Update 3, this has no effect.
 
-Supported values are ``98``, ``11``, ``14``, ``17``, ``20``, ``23``.
+Supported values are:
+
+``98``
+  C++98
+
+``11``
+  C++11
+
+``14``
+  C++14
+
+``17``
+  .. versionadded:: 3.8
+
+  C++17
+
+``20``
+  .. versionadded:: 3.12
+
+  C++20
+
+``23``
+  .. versionadded:: 3.20
+
+  C++23
 
 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
-- 
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