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-rw-r--r--doc/rtd/topics/network-config-format-v1.rst3
1 files changed, 2 insertions, 1 deletions
diff --git a/doc/rtd/topics/network-config-format-v1.rst b/doc/rtd/topics/network-config-format-v1.rst
index 3202163b..4c013d92 100644
--- a/doc/rtd/topics/network-config-format-v1.rst
+++ b/doc/rtd/topics/network-config-format-v1.rst
@@ -62,7 +62,8 @@ structure.
**mac_address**: *<MAC Address>*
The MAC Address is a device unique identifier that most Ethernet-based network
-devices possess. Specifying a MAC Address is optional.
+devices possess. Specifying a MAC Address is optional.
+Letters must be lowercase.
.. note::