diff --git a/man/systemd.network.xml b/man/systemd.network.xml
index 087e9e21563..c7e4db4e3ca 100644
--- a/man/systemd.network.xml
+++ b/man/systemd.network.xml
@@ -358,7 +358,24 @@
the routing table. Takes either a boolean argument, or the
values ipv4 or ipv6,
which only enables IP forwarding for the specified address
- family.
+ family. This controls the
+ net.ipv4.conf.<interface>.forwarding
+ and
+ net.ipv6.conf.<interface>.forwarding
+ sysctl options of the network interface (see ip-sysctl.txt
+ for details about sysctl options). Defaults to
+ no.
+
+ Note: unless this option is turned on, no IP
+ forwarding is done on this interface, even if this is
+ globally turned on in the kernel, with the
+ net.ipv4.ip_forward and
+ net.ipv4.ip_forward sysctl
+ options. Also, if this option is enabled for at least one
+ interface, the global options in the kernel are also enabled
+ as necessary, to ensure IP forwarding can take place.
+
IPMasquerade=
@@ -366,7 +383,8 @@
interface. If enabled packets forwarded from the network
interface will be appear as coming from the local host.
Takes a boolean argument. Implies
- IPForward=yes.
+ IPForward=yes. Defaults to
+ no.
Bridge=