diff --git a/docs/som/cm/cm3/README.md b/docs/som/cm/cm3/README.md
index 8d22811e9..785502467 100644
--- a/docs/som/cm/cm3/README.md
+++ b/docs/som/cm/cm3/README.md
@@ -6,4 +6,8 @@ sidebar_position: 10
 
 Radxa Compute Module 3(Radxa CM3)是基于 Rockchip RK3566 SoC 所实现的，具有小尺寸和紧凑布局的计算模块。
 
+:::note
+瑞莎 CM3 系列还包括采用 SODIMM 形态的 **Radxa CM3S** 计算模块（同样基于 Rockchip RK3566 SoC），可搭配 [Radxa CM3S IO Board](/accessories/io-board/cm3s-io-board) 进行功能评估与早期产品开发。
+:::
+
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diff --git a/i18n/en/docusaurus-plugin-content-docs/current/som/cm/cm3/README.md b/i18n/en/docusaurus-plugin-content-docs/current/som/cm/cm3/README.md
index 03021d705..d4c2b104d 100644
--- a/i18n/en/docusaurus-plugin-content-docs/current/som/cm/cm3/README.md
+++ b/i18n/en/docusaurus-plugin-content-docs/current/som/cm/cm3/README.md
@@ -6,4 +6,8 @@ sidebar_position: 10
 
 The Radxa Compute Module 3 (Radxa CM3) is a compact, space-efficient compute module based on the Rockchip RK3566 system-on-chip (SoC).
 
+:::note
+The Radxa CM3 family also includes the **Radxa CM3S** compute module in a SODIMM form factor (also based on the Rockchip RK3566 SoC). It can be used with the [Radxa CM3S IO Board](/accessories/io-board/cm3s-io-board) for feature evaluation and early-stage product development.
+:::
+
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