diff --git a/chapter-versions.sgml b/chapter-versions.sgml
--- a/chapter-versions.sgml
+++ b/chapter-versions.sgml
<chapt id="versions">
<heading>Version numbers and ABIs</heading>
+ <sect id="version-types">
+ The different types of version
+
+ <p>
+ <taglist>
+ <tag>Upstream version</tag>
+ <item>
+ The version that Linus or a stable series maintainer uses
+ for a release. Currently Linus will use the version
+ format: 2.6.<var>x</var>[-rc<var>y</var>]. Stable series
+ maintainers use the version format:
+ 2.6.<var>x</var>.<var>y</var>.
+ </item>
+ <tag>Package version</tag>
+ <item>
+ The version used in a Debian package. Following Debian
+ policy, it should follow the format
+ <var>upstreamversion</var>-<var>debianrevision</var>.
+ However, for an upstream release candidate, the string
+ '-rc' must be replaced with '~rc' so that it will be
+ recognised as an earlier version than the following release.
+ </item>
+ <tag>Kernel version</tag>
+ <item>
+ This is the version that appears in kernel messages,
+ filenames, package names and the output of 'uname -r'.
+ In official kernel packages it follows the format
+ <var>upstreamversion</var>[-<var>abiname</var>][-<var>featureset</var>]-<var>flavour</var>.
+ It is not changed for every new package version.
+ The <var>abiname</var> is changed as explained below.
+ </item>
+ </taglist>
+ </p>
+ </sect>
+
<sect id="abi">
The kernel ABI