diff --git a/openstack/identity/v3/tokens/results.go b/openstack/identity/v3/tokens/results.go
index fad369e..c970c67 100644
--- a/openstack/identity/v3/tokens/results.go
+++ b/openstack/identity/v3/tokens/results.go
@@ -14,6 +14,8 @@
 // commonResult is the deferred result of a Create or a Get call.
 type commonResult struct {
 	gophercloud.CommonResult
+
+	// header stores the headers from the original HTTP response because token responses are returned in an X-Subject-Token header.
 	header http.Header
 }