diff --git a/examples/playbook.yml b/examples/playbook.yml
index 8f324bcf..3dba8370 100644
--- a/examples/playbook.yml
+++ b/examples/playbook.yml
@@ -1,3 +1,4 @@
+---
 - name: Install swift server
   hosts: swift_all
   user: root
diff --git a/tests/ansible-role-requirements.yml b/tests/ansible-role-requirements.yml
index 01aed455..23521d19 100644
--- a/tests/ansible-role-requirements.yml
+++ b/tests/ansible-role-requirements.yml
@@ -1,3 +1,4 @@
+---
 - name: apt_package_pinning
   src: https://git.openstack.org/openstack/openstack-ansible-apt_package_pinning
   scm: git
diff --git a/zuul.d/project.yaml b/zuul.d/project.yaml
index fe56b22e..a0b5a6a3 100644
--- a/zuul.d/project.yaml
+++ b/zuul.d/project.yaml
@@ -1,3 +1,4 @@
+---
 # Copyright 2017, Rackspace US, Inc.
 #
 # Licensed under the Apache License, Version 2.0 (the "License");