odhcpd: document the "upstream" option

I'm not 100% sure about whether this option will get automagically set e.g. by
the data that is returned from the netifd ubus call, but this documentation is
better than nothing.

Signed-off-by: David Härdeman <david@hardeman.nu>
Link: https://github.com/openwrt/odhcpd/pull/294
Signed-off-by: Álvaro Fernández Rojas <noltari@gmail.com>

diff --git a/README.md b/README.md
index 0ee2e22d76ec89cfae27835aacc308bbb748209c..48ec641dd0f2b4c625f540f0d1f78a36bec94145 100644 (file)
--- a/README.md
+++ b/README.md
@@ -120,7 +120,7 @@ and may also receive information from ubus
 | ndp_from_link_local  |bool   | 1     | Use link-local source addresses for NDP operations (RFC 4861, §4.2 compliance) and macOS compatibility |
 | prefix_filter                |string |`::/0` | Only advertise on-link prefixes within the provided IPv6 prefix; others are filtered out. [IPv6 prefix] |
 | ntp                  |list   |`<local address>`| NTP servers to announce accepts IPv4 and IPv6 |
-| upstream             |list   | -     | TBD |
+| upstream             |list   | -     | A list of interfaces which can be used as a source of configuration information (e.g. for NTP servers, if not set explicitly). |
 
 [//]: # "dhcpv6_raw - string - not documented, may change when generic DHCPv4/DHCPv6 options are added"