From 5ca4bd5d9018bb7572f10825e1ca431444601be7 Mon Sep 17 00:00:00 2001
From: "Ondrej Zajicek (work)" <santiago@crfreenet.org>
Date: Wed, 26 Apr 2017 17:13:45 +0200
Subject: Flowspec: Max tcp mask length is 12 bits

---
 doc/bird.sgml | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

(limited to 'doc/bird.sgml')

diff --git a/doc/bird.sgml b/doc/bird.sgml
index 0e072dd2..4bbcb871 100644
--- a/doc/bird.sgml
+++ b/doc/bird.sgml
@@ -768,7 +768,8 @@ logical operators <cf/&&/ or <cf/||/. Allowed relational operators are <cf/=/,
 
 	<tag><label id="flow-tcp-flags">tcp flags <m/bitmask-match/</tag>
 	Set a matching bitmask for TCP header flags (aka control bits) (e.g.
-	<cf>tcp flags 0x03/0x0f;</cf>).
+	<cf>tcp flags 0x03/0x0f;</cf>). The maximum length of mask is 12 bits
+	(0xfff).
 
 	<tag><label id="flow-length">length <m/numbers-match/</tag>
 	Set a matching packet length (e.g. <cf>length > 1500;</cf>)
-- 
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