diff --git a/docs/en/api-reference/system/ota.rst b/docs/en/api-reference/system/ota.rst
index e2dd0b09ee..3f8bd7ef9a 100644
--- a/docs/en/api-reference/system/ota.rst
+++ b/docs/en/api-reference/system/ota.rst
@@ -288,7 +288,7 @@ The command-line interface of `otatool.py` has the following structure:
   otatool.py --port "/dev/ttyUSB1" switch_ota_partition --slot 1
 
   # Read OTA partition 'ota_3' and save contents to a file named 'ota_3.bin'
-  otatool.py --port "/dev/ttyUSB1" read_ota_partition --name=ota_3
+  otatool.py --port "/dev/ttyUSB1" read_ota_partition --name=ota_3 --output=ota_3.bin
 
 
 More information can be obtained by specifying `--help` as argument:
diff --git a/docs/zh_CN/api-reference/system/ota.rst b/docs/zh_CN/api-reference/system/ota.rst
index b3ac7f396b..ecd43c5c56 100644
--- a/docs/zh_CN/api-reference/system/ota.rst
+++ b/docs/zh_CN/api-reference/system/ota.rst
@@ -269,7 +269,7 @@ Python API
   otatool.py --port "/dev/ttyUSB1" switch_ota_partition --slot 1
 
   # 读取 OTA 分区 'ota_3'，将内容保存至文件 'ota_3.bin'
-  otatool.py --port "/dev/ttyUSB1" read_ota_partition --name=ota_3
+  otatool.py --port "/dev/ttyUSB1" read_ota_partition --name=ota_3 --output=ota_3.bin
 
 
 更多信息可用 `--help` 指令查看：