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-rw-r--r--doc/rtd/topics/network-config-format-v2.rst6
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diff --git a/doc/rtd/topics/network-config-format-v2.rst b/doc/rtd/topics/network-config-format-v2.rst
index 335d236a..ea370ef5 100644
--- a/doc/rtd/topics/network-config-format-v2.rst
+++ b/doc/rtd/topics/network-config-format-v2.rst
@@ -174,6 +174,12 @@ recognized by ``inet_pton(3)``
Example for IPv4: ``gateway4: 172.16.0.1``
Example for IPv6: ``gateway6: 2001:4::1``
+**mtu**: *<MTU SizeBytes>*
+
+The MTU key represents a device's Maximum Transmission Unit, the largest size
+packet or frame, specified in octets (eight-bit bytes), that can be sent in a
+packet- or frame-based network. Specifying ``mtu`` is optional.
+
**nameservers**: *<(mapping)>*
Set DNS servers and search domains, for manual address configuration. There