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-rw-r--r--pxeboot.write.help12
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diff --git a/pxeboot.write.help b/pxeboot.write.help
index 3aefe75e..7cb78bce 100644
--- a/pxeboot.write.help
+++ b/pxeboot.write.help
@@ -152,3 +152,15 @@ help: >
device tree blob if specified, will not be removed after the
deployment finishes. This variable is only meanful on the
`existing-server` mode.
+
+
+ ## PXEBOOT_TARGET_INTERFACE
+
+ Name of the interface of the target to pxeboot from. Some targets
+ with more than one interface try to get the rootfs from a different
+ interface than the interface from where the pxeboot server is
+ reachable. Using this variable, the kernel arguments will be filled
+ to include the device.
+
+ Note that the name of this interface is the kernel's default name,
+ usually called ethX, and is non-determinisic.