From e08d2ff08e4cff4bec38878e084fee7666caaaf2 Mon Sep 17 00:00:00 2001
From: Ondrej Zajicek <santiago@crfreenet.org>
Date: Sun, 26 Jun 2011 17:09:24 +0200
Subject: Adds filter clist operation.

---
 doc/bird.sgml | 11 ++++++++---
 1 file changed, 8 insertions(+), 3 deletions(-)

(limited to 'doc')

diff --git a/doc/bird.sgml b/doc/bird.sgml
index fbda9f4..8a8c227 100644
--- a/doc/bird.sgml
+++ b/doc/bird.sgml
@@ -849,10 +849,15 @@ incompatible with each other (that is to prevent you from shooting in the foot).
 	  operator deletes all items from clist <m/C/ that are also
 	  members of set <m/P/.
 
-          Statement <cf><m/C/ = add(<m/C/, <m/P/);</cf> can be shortened to
-          <cf><m/C/.add(<m/P/);</cf> if <m/C/ is appropriate route attribute
-          (for example <cf/bgp_community/). Similarly for <cf/delete/.
+          <cf>filter(<m/C/,<m/P/)</cf> deletes all items from clist
+	  <m/C/ that are not members of pair (or quad) set <m/P/.
+	  I.e., <cf/filter/ do the same as <cf/delete/ with inverted
+	  set <m/P/.
 
+          Statement <cf><m/C/ = add(<m/C/, <m/P/);</cf> can be shortened to
+          <cf><m/C/.add(<m/P/);</cf> if <m/C/ is appropriate route
+          attribute (for example <cf/bgp_community/). Similarly for
+          <cf/delete/ and <cf/filter/.
 </descrip>
 
 <sect>Operators
-- 
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