diff --git a/manifests/params.pp b/manifests/params.pp
index 21254ed..74df64d 100644
--- a/manifests/params.pp
+++ b/manifests/params.pp
@@ -34,6 +34,7 @@ class jenkins::params {
       $pkgconfig_package = 'pkgconfig'
       $pyflakes_package = 'pyflakes'
       $python_libvirt_package = 'libvirt-python'
+      $python_lxml_package = 'python-lxml'
       $python_zmq_package = 'python-zmq'
       # FIXME: No Python3 packages on RHEL
       #$python3_dev_package = 'python3-devel'
@@ -74,6 +75,7 @@ class jenkins::params {
       $pkgconfig_package = 'pkg-config'
       $pyflakes_package = 'pyflakes'
       $python_libvirt_package = 'python-libvirt'
+      $python_lxml_package = 'python-lxml'
       $python_zmq_package = 'python-zmq'
       $python3_dev_package = 'python3-all-dev'
       $rubygems_package = 'rubygems'
diff --git a/manifests/slave.pp b/manifests/slave.pp
index 5fc4e59..9d0337b 100644
--- a/manifests/slave.pp
+++ b/manifests/slave.pp
@@ -47,6 +47,7 @@ class jenkins::slave(
     $::jenkins::params::pkgconfig_package, # for spidermonkey, used by ceilometer
     $::jenkins::params::pyflakes_package,
     $::jenkins::params::python_libvirt_package,
+    $::jenkins::params::python_lxml_package, # for validating openstack manuals
     $::jenkins::params::python_zmq_package, # zeromq unittests (not pip installable)
     $::jenkins::params::rubygems_package,
     $::jenkins::params::sqlite_package,