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diff --git a/doc/bird.sgml b/doc/bird.sgml
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@@ -3436,6 +3436,12 @@ dsc-iface
as a default router. For <cf/sensitive/ option, see <ref id="radv-trigger" name="trigger">.
Default: 3 * <cf/max ra interval/, <cf/sensitive/ yes.
+ <tag><label id="radv-iface-linger-time">linger time <m/expr/</tag>
+ When a prefix disappears, it is advertised for some time with 0
+ lifetime, to inform clients the prefix is no longer usable. This option
+ sets the time for how long it is advertised (in seconds). Maximum is
+ 3600, 0 means disabled. Default: 300.
+
<tag><label id="radv-iface-default-preference-low">default preference low|medium|high</tag>
This option specifies the Default Router Preference value to advertise
to hosts. Default: medium.