Add the version note in OpenStack builder section

website/source/docs/builders/openstack.html.md

@@ -25,6 +25,9 @@ created. This simplifies configuration quite a bit.
 The builder does *not* manage images. Once it creates an image, it is up to you
 to use it or delete it.
 
+~> **Note:** To use OpenStack builder with the OpenStack Newton (Oct 2016) 
+or earlier, we recommend you use Packer v1.1.2 or earlier version.
+
 ~> **OpenStack Liberty or later requires OpenSSL!** To use the OpenStack
 builder with OpenStack Liberty (Oct 2015) or later you need to have OpenSSL
 installed *if you are using temporary key pairs*, i.e. don't use
@@ -32,6 +35,7 @@ installed *if you are using temporary key pairs*, i.e. don't use
 [`ssh_password`](/docs/templates/communicator.html#ssh_password). All major
 OS'es have OpenSSL installed by default except Windows.
 
+
 ## Configuration Reference
 
 There are many configuration options available for the builder. They are