[PATCH] doc: bootstd: Describe the optional extension_overlay_addr environment

[Kory Maincent]

From: "Kory Maincent (TI.com)" <kory.maincent at bootlin.com>

Add extension_overlay_addr description to the list of environment
variables that can be useful during the standard boot.

Signed-off-by: Kory Maincent (TI.com) <kory.maincent at bootlin.com>
---
 doc/develop/bootstd/overview.rst | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/doc/develop/bootstd/overview.rst b/doc/develop/bootstd/overview.rst
index 6cf3b48efca..d3dba2a3405 100644
--- a/doc/develop/bootstd/overview.rst
+++ b/doc/develop/bootstd/overview.rst
@@ -261,6 +261,9 @@ fdt_addr_r
 fdtoverlay_addr_r (needed if overlays are used)
     Address at which to load the overlay for the FDT, e.g. 0x02000000
 
+extension_overlay_addr (needed if extension is used)
+    Address at which to load the extension FDT overlays, e.g. 0x02000000
+
 kernel_addr_r
     Address at which to load the kernel, e.g. 0x02080000
 
-- 
2.43.0