diff --git a/chapter03/introduction.xml b/chapter03/introduction.xml
index ba7e16366..c0a89afac 100644
--- a/chapter03/introduction.xml
+++ b/chapter03/introduction.xml
@@ -13,12 +13,21 @@
   <para>This chapter includes a list of packages that need to be downloaded in
   order to build a basic Linux system. The listed version numbers correspond to
   versions of the software that are known to work, and this book is based on
-  their use. We highly recommend against using newer versions because the build
-  commands for one version may not work with a newer version. The newest package
+  their use. We highly recommend against using different versions because the build
+  commands for one version may not work with a different version. The newest package
   versions may also have problems that require work-arounds. These work-arounds
   will be developed and stabilized in the development version of the
   book.</para>
 
+  <para>For some packages, the release tarball and the (Git or SVN)
+  repository snapshot tarball for this release may be published with
+  similar file name.  A release tarball contains generated files (for
+  example, <command>configure</command> script generated by
+  <command>autoconf</command>), in addition to the contents of the
+  corresponding repository snapshot.  The book uses release tarballs
+  whenever possible. Using a repository snapshot instead of a release
+  tarball specified by the book will cause problems.</para>
+
   <para>Download locations may not always be accessible. If a download
   location has changed since this book was published, Google (<ulink
   url="http://www.google.com/"/>) provides a useful search engine for