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diff --git a/doc/develop/bootstd/overview.rst b/doc/develop/bootstd/overview.rst
index f0d420361f7..397f6db18b4 100644
--- a/doc/develop/bootstd/overview.rst
+++ b/doc/develop/bootstd/overview.rst
@@ -252,6 +252,9 @@ Various environment variables are used by standard boot. These allow the board
to control where things are placed when booting the OS. You should ensure that
your boards sets values for these.
+extension_overlay_addr (needed if extension is used)
+ Address at which to load the extension FDT overlays, e.g. 0x02000000
+
fdtfile
Name of the flattened device tree (FDT) file to load, e.g.
"rockchip/rk3399-rockpro64.dtb"