[update] README.md add cortex-m33

1 files changed, 1 insertions, 0 deletions

diff --git a/README.md b/README.md
index fb1005a415..7362c99d80 100644
--- a/README.md
+++ b/README.md
@@ -77,6 +77,7 @@ RT-Thread supports many architectures, and has covered the major architectures i
 - **ARM Cortex-M4**：manufacturers like ST、Nuvton、NXP、GigaDevice、Realtek、Ambiq Micro, ect.
 - **ARM Cortex-M7**：manufacturers like ST、NXP
 - **ARM Cortex-M23**：manufacturers like GigaDevice
+- **ARM Cortex-M33**：manufacturers like ST
 - **ARM Cortex-R4**
 - **ARM Cortex-A8/A9**：manufacturers like NXP
 - **ARM7**：manufacturers like Samsung