net/mld: update help manual for mld router
@@ -20,7 +20,15 @@ config NET_MLD_ROUTER
default n
---help---
Enables a few hooks that will be needed for router support in the
- future. Not yet ready for prime time.
+ future. Use IPv6 multicast routers to discover the presence of multicast
+ listeners (nodes configured to receive IPv6 multicast packets)
+ on its directly attached links and to discover which multicast packets
+ are of interest to neighboring nodes. All IPv6 multicast routers that
+ run MLD on the same subnet can monitor MLD listener report messages
+ (often called reports) from hosts. However, only one router can act as
+ the MLD querier to send MLD query messages (often called queries).
+ A querier election mechanism determines which router acts as the MLD
+ querier on the subnet.
config NET_MLD_DEBUG
bool "Force MLD debug"
