diff --git a/en/peripherals/machine.UART.md b/en/peripherals/machine.UART.md
index 19a22149c15c9c3ebab1b1a6bdd04096af580fa2..c8c714f6f62bc421b8449e049c72dc59d045aa03 100644
--- a/en/peripherals/machine.UART.md
+++ b/en/peripherals/machine.UART.md
@@ -784,7 +784,7 @@ This class transmits data through the UART.
 </tr>
 <tr>
   <td>uart1(group = 2)</td>
-  <td>pin27</td>
+  <td>pin29</td>
   <td>pin28</td>
   <td>NULL</td>
   <td>NULL</td>
diff --git a/zh/peripherals/machine.UART.md b/zh/peripherals/machine.UART.md
index 1dcb9f47775754321a046dfe8cfa01df82b9be8e..7244c3603c262326c66854e3c52b21215e600719 100644
--- a/zh/peripherals/machine.UART.md
+++ b/zh/peripherals/machine.UART.md
@@ -816,7 +816,7 @@
 </tr>
 <tr>
   <td>uart1(group = 2)</td>
-  <td>引脚号27</td>
+  <td>引脚号29</td>
   <td>引脚号28</td>
   <td>NULL</td>
   <td>NULL</td>