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diff --git a/doc/usage/environment.rst b/doc/usage/environment.rst
index cc33d3ec0f2..7bd9ffce8d8 100644
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@@ -323,6 +323,11 @@ netretry
Useful on scripts which control the retry operation
themselves.
+rng_seed_size
+ Size of random value added to device-tree node /chosen/rng-seed.
+ This variable is given as a decimal number.
+ If unset, 64 bytes is used as the default.
+
silent_linux
If set then Linux will be told to boot silently, by
adding 'console=' to its command line. If "yes" it will be