From e375a87a56d8f6c73a85e6046b3b8578f1444ee1 Mon Sep 17 00:00:00 2001
From: Daisuke Takahashi <daisuke_takahashi_xa@cyberagent.co.jp>
Date: Thu, 13 Sep 2018 18:52:35 +0900
Subject: [PATCH] OpenStack: Update documentation for `image_disk_format`

---
 website/source/docs/builders/openstack.html.md | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/website/source/docs/builders/openstack.html.md b/website/source/docs/builders/openstack.html.md
index 28566bd0d..ab75b1071 100644
--- a/website/source/docs/builders/openstack.html.md
+++ b/website/source/docs/builders/openstack.html.md
@@ -275,6 +275,9 @@ builder.
     zones aren't specified, the default enforced by your OpenStack cluster will
     be used.
 
+-   `image_disk_format` (string) - Disk format of the resulting image.
+    This option works if `use_blockstorage_volume` is true.
+
 ## Basic Example: DevStack
 
 Here is a basic example. This is a example to build on DevStack running in a VM.