get volume
diff --git a/openstack/blockstorage/v1/volumes/volumes.go b/openstack/blockstorage/v1/volumes/volumes.go
index 77f19af..741e4bf 100644
--- a/openstack/blockstorage/v1/volumes/volumes.go
+++ b/openstack/blockstorage/v1/volumes/volumes.go
@@ -16,4 +16,5 @@
 	Size                int
 }
 type CreateOpts map[string]interface{}
+type GetOpts map[string]string
 type DeleteOpts map[string]string