diff --git a/lib/xenu_nntp/session.py b/lib/xenu_nntp/session.py
index 814ed95..ca0993c 100644
--- a/lib/xenu_nntp/session.py
+++ b/lib/xenu_nntp/session.py
@@ -665,7 +665,9 @@ class Session(Connection):
             'from':       True,
             'date':       True,
             'message-id': True,
-            'references': True
+            'references': True,
+            'bytes':      True,
+            'lines':      True,
         }
 
         for k in message.headers: