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diff --git a/doc/bird.sgml b/doc/bird.sgml
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@@ -981,6 +981,11 @@ for each neighbor using the following configuration parameters:
<tag>path metric <m/switch/</tag> Enable comparison of path lengths
when deciding which BGP route is the best one. Default: on.
+ <tag>prefer older <m/switch/</tag> Standard route selection algorithm
+ breaks ties by comparing router IDs. This changes the behavior
+ to prefer older routes (when both are external and from different
+ peer). For details, see RFC 5004. Default: off.
+
<tag>default bgp_med <m/number/</tag> Value of the Multiple Exit
Discriminator to be used during route selection when the MED attribute
is missing. Default: 0.