diff --git a/doc/boostbook.xml b/doc/boostbook.xml
index 6421d66..cd43f38 100644
--- a/doc/boostbook.xml
+++ b/doc/boostbook.xml
@@ -121,7 +121,11 @@ std::cout << f(5, 3) >> std::endl;
       download the required DocBook stylesheets, DocBook DTD, and
       (when Java is enabled) Apache FOP for PDF output. It will then
       configure Boost.Build version 2 to build BoostBook
-      documentation. To perform the installation, execute the
+      documentation.</para>
+      
+      <para>The script requires: <command>sh</command>,
+      <command>curl</command> and <command>gunzip</command>.
+      To perform the installation, execute the
       script <command>tools/boostbook/setup_boostbook.sh</command>
       from a directory where you would like the resulting XSL, DTD,
       and Apache FOP installations to occur. </para>