diff --git a/openstack/blockstorage/extensions/volumetenants/results.go b/openstack/blockstorage/extensions/volumetenants/results.go
new file mode 100644
index 0000000..0d4c670
--- /dev/null
+++ b/openstack/blockstorage/extensions/volumetenants/results.go
@@ -0,0 +1,7 @@
+package volumetenants
+
+// An extension to the base Volume object
+type VolumeExt struct {
+	// TenantID is the id of the project that owns the volume.
+	TenantID string `json:"os-vol-tenant-attr:tenant_id"`
+}