diff --git a/safaribooks.py b/safaribooks.py
index 308cb59..31634db 100644
--- a/safaribooks.py
+++ b/safaribooks.py
@@ -417,6 +417,7 @@ class SafariBooks:
 
         if update_referer:
             # TODO Update Referer HTTP Header
+            # TODO How about Origin? 
             self.HEADERS["referer"] = response.request.url
 
         if response.is_redirect and perfom_redirect: