diff --git a/RELNOTES b/RELNOTES
index 24c74918..98d31ab5 100644
--- a/RELNOTES
+++ b/RELNOTES
@@ -52,6 +52,11 @@ The system has only been tested on Linux, FreeBSD, and Solaris, and
 may not work on other platforms. Please report any problems and 
 suggested fixes to <dhcp-users@isc.org>.
 
+			Changes since 4.0.0rc1
+
+- The DHCPv6 server would not send the preference option unless the 
+  client requested it, via the ORO. This has been fixed, so the DHCPv6
+  server will always send the preference value if it is configured.
 
 			Changes since 4.0.0b3
 
diff --git a/server/dhcpv6.c b/server/dhcpv6.c
index f0b6df08..1cfe6507 100644
--- a/server/dhcpv6.c
+++ b/server/dhcpv6.c
@@ -641,6 +641,7 @@ static const int required_opts[] = {
 	D6O_CLIENTID,
 	D6O_SERVERID,
 	D6O_STATUS_CODE,
+	D6O_PREFERENCE,
 	0
 };
 static const int required_opts_solicit[] = {
@@ -652,6 +653,7 @@ static const int required_opts_solicit[] = {
 	D6O_STATUS_CODE,
 	D6O_VENDOR_OPTS,
 	D6O_RECONF_ACCEPT,
+	D6O_PREFERENCE,
 	0
 };
 static const int required_opts_IA_NA[] = {