diff --git a/manifests/job_builder.pp b/manifests/job_builder.pp
index 1e6ae1b..ed4fcf6 100644
--- a/manifests/job_builder.pp
+++ b/manifests/job_builder.pp
@@ -8,7 +8,9 @@ class jenkins::job_builder (
   $git_url = 'https://git.openstack.org/openstack-infra/jenkins-job-builder',
   $config_dir = '',
   $jenkins_jobs_update_timeout = '600',
+  $extensions = [],
 ) {
+  validate_array($extensions)
 
   # A lot of things need yaml, be conservative requiring this package to avoid
   # conflicts with other modules.
diff --git a/templates/jenkins_jobs.ini.erb b/templates/jenkins_jobs.ini.erb
index 14873a1..de26e73 100644
--- a/templates/jenkins_jobs.ini.erb
+++ b/templates/jenkins_jobs.ini.erb
@@ -2,3 +2,10 @@
 user=<%= @username %>
 password=<%= @password %>
 url=<%= @url %>
+
+<% @extensions.each do |extension| -%>
+["<%= extension['name'] %>"]
+<% @extension['parameters'].each do |parameter| -%>
+<%= parameter['name'] %> = <%= parameter['value'] %>
+<% end -%>
+<% end -%>