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-rw-r--r--Documentation/networking/phy.rst5
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diff --git a/Documentation/networking/phy.rst b/Documentation/networking/phy.rst
index b2f7ec794bc8..399f17976a6c 100644
--- a/Documentation/networking/phy.rst
+++ b/Documentation/networking/phy.rst
@@ -286,6 +286,11 @@ Some of the interface modes are described below:
Note: due to legacy usage, some 10GBASE-R usage incorrectly makes
use of this definition.
+``PHY_INTERFACE_MODE_100BASEX``
+ This defines IEEE 802.3 Clause 24. The link operates at a fixed data
+ rate of 125Mpbs using a 4B/5B encoding scheme, resulting in an underlying
+ data rate of 100Mpbs.
+
Pause frames / flow control
===========================