Updates add-path documentation.

diff --git a/doc/bird.sgml b/doc/bird.sgml
index 269743d5a8febc97fc5d339c0bd0d03d87571d23..04417e21b2f6634edf56eaae4cad68b2fca0bf9d 100644 (file)
--- a/doc/bird.sgml
+++ b/doc/bird.sgml
@@ -1682,6 +1682,15 @@ for each neighbor using the following configuration parameters:
        This option requires that the connected routing table is
        <ref id="dsc-sorted" name="sorted">. Default: off.
 
+       <tag>add paths <m/switch/|rx|tx</tag>
+       Standard BGP can propagate only one path (route) per destination network
+       (usually the selected one). This option controls the add-path protocol
+       extension, which allows to advertise any number of paths to a
+       destination. Note that to be active, add-path has to be enabled on both
+       sides of the BGP session, but it could be enabled separately for RX and
+       TX direction. When active, all available routes accepted by the export
+       filter are advertised to the neighbor. Default: off.
+
        <tag>allow local as [<m/number/]</tag> 
        BGP prevents routing loops by rejecting received routes with
        the local AS number in the AS path. This option allows to