diff --git a/src/process.c b/src/process.c
index a95192d8fba..d30b17d45e5 100644
--- a/src/process.c
+++ b/src/process.c
@@ -3758,8 +3758,9 @@ also nil, meaning that this process is not associated with any buffer.
 address.  The symbol `local' specifies the local host.  If specified
 for a server process, it must be a valid name or address for the local
 host, and only clients connecting to that address will be accepted.
-`local' will use IPv4 by default, use a FAMILY of 'ipv6 to override
-this.
+If all interfaces should be bound, an address of \"0.0.0.0\" (for
+ipv4) or \"::\" (for ipv6) can be used.  `local' will use IPv4 by
+default, use a FAMILY of 'ipv6 to override this.
 
 :service SERVICE -- SERVICE is name of the service desired, or an
 integer specifying a port number to connect to.  If SERVICE is t,