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diff --git a/doc/bird.sgml b/doc/bird.sgml
index 78569d28..fde47e65 100644
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@@ -2562,6 +2562,15 @@ be used in explicit configuration.
explicitly (to conserve memory). This option requires that the connected
routing table is <ref id="dsc-table-sorted" name="sorted">. Default: off.
+ <tag><label id="bgp-extended-next-hop">extended next hop <m/switch/</tag>
+ BGP expects that announced next hops have the same address family as
+ associated network prefixes. This option provides an extension to use
+ IPv4 next hops with IPv6 prefixes and vice versa. For IPv4 / VPNv4
+ channels, the behavior is controlled by the Extended Next Hop Encoding
+ capability, as described in <rfc id="5549">. For IPv6 / VPNv6 channels,
+ just IPv4-mapped IPv6 addresses are used, as described in
+ <rfc id="4798"> and <rfc id="4659">. Default: off.
+
<tag><label id="bgp-add-paths">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