diff --git a/boards/renesas/rzg3s_smarc/doc/index.rst b/boards/renesas/rzg3s_smarc/doc/index.rst
index af340fa804c..c34476145bb 100644
--- a/boards/renesas/rzg3s_smarc/doc/index.rst
+++ b/boards/renesas/rzg3s_smarc/doc/index.rst
@@ -48,6 +48,13 @@ The Renesas RZ/G3S MPU documentation can be found at `RZ/G3S Group Website`_
 
 	RZ/G3S block diagram (Credit: Renesas Electronics Corporation)
 
+Multi-OS processing
+*******************
+
+The RZ/G3S-EVKIT allows different applications to be executed in RZ/G3S SoC. With its multi-core architecture,
+each core can operate independently to perform customized tasks or exchange data using the OpenAMP framework.
+Please see :zephyr:code-sample:`rz-openamp-linux-zephyr` sample for reference.
+
 Supported Features
 ==================
 
@@ -77,6 +84,8 @@ and the following hardware features:
 +-----------+------------+-------------------------------------+
 | CLOCK     | on-chip    | clock control                       |
 +-----------+------------+-------------------------------------+
+| MHU       | on-chip    | mbox                                |
++-----------+------------+-------------------------------------+
 
 Other hardware features are currently not supported by the port.