diff --git a/spec/index.bs b/spec/index.bs
index f5298bdbc..c213c5021 100644
--- a/spec/index.bs
+++ b/spec/index.bs
@@ -579,8 +579,9 @@ by the [=IDP=].
 
 The manifest discovery endpoint is fetched:
 
-(a) **without** cookies and
-(b) **with** a special [[#Sec-FedCM-CSRF]] header, and
+(a) **without** cookies,
+(b) **with** a special [[#Sec-FedCM-CSRF]] header,
+(c) **without** a [[RFC7231#header.referer|Referer]] header, and
 (c) **without** following [[RFC7231#header.location|HTTP redirects]].
 
 For example: