diff --git a/man/systemd.network.xml b/man/systemd.network.xml
index 77d7ce5c18..5c906381f1 100644
--- a/man/systemd.network.xml
+++ b/man/systemd.network.xml
@@ -1986,7 +1986,7 @@ IPv6Token=prefixstable:2002:da8:1::
DHCP server. After a new IP is received, the DHCPv4 client performs IPv4 Duplicate Address
Detection. If duplicate use is detected, the DHCPv4 client rejects the IP by sending a
DHCPDECLINE packet and tries to obtain an IP address again. See RFC 5224. Defaults to
+ url="https://tools.ietf.org/html/rfc5227">RFC 5227. Defaults to
unset.