Mention manylinux2010 in platform tags specification

source/specifications/platform-compatibility-tags.rst

@@ -8,6 +8,21 @@ Platform compatibility tags
 The platform compatibility tagging model used for ``wheel`` distribution is
 defined in :pep:`425`.
 
-The scheme defined in that PEP is insufficient for public distribution
-of Linux wheel files (and \*nix wheel files in general), so :pep:`513` was
-created to define the ``manylinux1`` tag.
+.. _manylinux:
+
+Manylinux tags
+==============
+
+The scheme defined in :pep:`425` is insufficient for public distribution
+of Linux wheel files (and \*nix wheel files in general), so the *manylinux*
+platform tags were defined, to allow providing wheels for many common Linux
+distributions. See :pep:`513` for more about how this works.
+
+* ``manylinux1`` is defined in :pep:`513`, for x86_64 and i686 architectures.
+* ``manylinux2010`` is defined in :pep:`571`, for x86_64 and i686 architectures.
+  It is based on a platform from 2010, whereas ``manylinux1`` is based on a
+  platform from 2007. This means that ``manylinux2010`` packages are easier to
+  create, but not compatible with some older systems where ``manylinux1``
+  packages would work.
+
+  ``manylinux2010`` is not yet widely recognised by install tools.