diff --git a/lib/nntp/tiny/session.py b/lib/nntp/tiny/session.py
index 40c9ebe..16438f4 100644
--- a/lib/nntp/tiny/session.py
+++ b/lib/nntp/tiny/session.py
@@ -651,6 +651,7 @@ class Session():
         'BODY':         _cmd_body,
         'ARTICLE':      _cmd_article,
         'HDR':          _cmd_hdr,
+        'XHDR':         _cmd_hdr,
         'STAT':         _cmd_stat,
         'DATE':         _cmd_date,
         'QUIT':         _cmd_quit,