DOC: Describe routing impact of using interface keyword on bind lines
diff --git a/doc/configuration.txt b/doc/configuration.txt
index 89421db..7cc5c13 100644
--- a/doc/configuration.txt
+++ b/doc/configuration.txt
@@ -10799,7 +10799,12 @@
interface, not an aliased interface. It is also possible to bind multiple
frontends to the same address if they are bound to different interfaces. Note
that binding to a network interface requires root privileges. This parameter
- is only compatible with TCPv4/TCPv6 sockets.
+ is only compatible with TCPv4/TCPv6 sockets. When specified, return traffic
+ uses the same interface as inbound traffic, and its associated routing table,
+ even if there are explicit routes through different interfaces configured.
+ This can prove useful to address asymmetric routing issues when the same
+ client IP addresses need to be able to reach frontends hosted on different
+ interfaces.
level <level>
This setting is used with the stats sockets only to restrict the nature of