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-rw-r--r--docs/configuration/service/router-advert.md7
1 files changed, 4 insertions, 3 deletions
diff --git a/docs/configuration/service/router-advert.md b/docs/configuration/service/router-advert.md
index 9a70067e..7f0ba895 100644
--- a/docs/configuration/service/router-advert.md
+++ b/docs/configuration/service/router-advert.md
@@ -62,9 +62,10 @@ from DHCPv6-PD.
```{cfgcmd} set service router-advert interface \<interface\> prefix \<prefix\> base-interface \<interface\>
The advertised prefix is combined with the IPv6 address of the specified
-interface (for example, a WAN interface) to derive the advertised prefix's
-host bits. This option is only allowed together with the wildcard prefix
-`::/64`.
+interface (for example, a WAN interface) so that the network portion of
+the RA prefix follows that interface's current IPv6 address. This option
+is only allowed together with the wildcard prefix `::/64`, and is the
+typical way to re-advertise a DHCPv6-PD-assigned prefix.
```
```{eval-rst}