Index: docs/CommandGuide/clang.rst
===================================================================
--- docs/CommandGuide/clang.rst
+++ docs/CommandGuide/clang.rst
@@ -98,9 +98,57 @@
 
  Treat subsequent input files as having type language.
 
-.. option:: -std=<language>
+.. option:: -std=<standard>
 
  Specify the language standard to compile for.
+
+ Supported options for the C language are:
+
+ - ``c89``, ``c90`` or ``iso9899:1990``: ISO C 1990
+ - ``iso9899:199409``: ISO C 1990 with amendment 1
+ - ``gnu89`` or ``gnu90``: ISO C 1990 with GNU extensions
+ - ``c99``, ``iso9899:1999``, ``c9x`` (deprecated) or ``iso9899:199x``
+   (deprecated): ISO C 1999
+ - ``gnu99`` or ``gnu9x`` (deprecated): ISO C 1999 with GNU extensions
+ - ``c11``, ``iso9899:2011``, ``c1x`` (deprecated) or ``iso9899:201x``
+   (deprecated): ISO C 2011
+ - ``gnu11`` or ``gnu1x`` (deprecated): ISO C 2011 with GNU extensions
+ - ``c17`` or ``iso9899:2017``: ISO C 2017
+ - ``gnu17``: ISO C 2017 with GNU extensions
+
+ The default C language standard is ``gnu11``, except on PS4, where it is
+ ``gnu99``.
+
+ Supported options for the C++ language are:
+
+ - ``c++98`` or ``c++03``: ISO C++ 1998 with amendments
+ - ``gnu++98`` or ``gnu++03``: ISO C++ 1998 with amendments and GNU extensions
+ - ``c++11`` or ``c++0x`` (deprecated): ISO C++ 2011 with amendments
+ - ``gnu++11`` or ``gnu++0x`` (deprecated): ISO C++ 2011 with amendments and
+   GNU extensions
+ - ``c++14`` or ``c++1y`` (deprecated): ISO C++ 2014 with amendments
+ - ``gnu++14`` or ``gnu++1y`` (deprecated): ISO C++ 2014 with amendments and
+   GNU extensions
+ - ``c++17`` or ``c++1z`` (deprecated): ISO C++ 2017 with amendments
+ - ``gnu++17`` or ``gnu++1z`` (deprecated): ISO C++ 2017 with amendments and
+   GNU extensions
+ - ``c++2a``: Working draft for ISO C++ 2020
+ - ``gnu++2a``: Working draft for ISO C++ 2020 with GNU extensions
+
+ The default C++ language standard is ``gnu++14``.
+
+ Supported options for the OpenCL language are:
+
+ - ``cl1.0`` or ``cl`` (deprecated): OpenCL 1.0
+ - ``cl1.1``: OpenCL 1.1
+ - ``cl1.2``: OpenCL 1.2
+ - ``cl2.0``: OpenCL 2.0
+
+ The default OpenCL language standard is ``cl1.0``.
+
+ Supported options for the CUDA language are:
+
+ - ``cuda``: NVIDIA CUDA(tm)
 
 .. option:: -stdlib=<library>