diff --git a/docs/en/api-guides/build-system.rst b/docs/en/api-guides/build-system.rst
index a2469d325d97..2e317e14d952 100644
--- a/docs/en/api-guides/build-system.rst
+++ b/docs/en/api-guides/build-system.rst
@@ -70,7 +70,7 @@ When ``idf.py`` does something, it prints each command that it runs for easy ref
 
   mkdir -p build
   cd build
-  cmake .. -G Ninja   # or 'Unix Makefiles'
+  cmake .. -DIDF_TARGET={IDF_TARGET_PATH_NAME} -G Ninja   # or 'Unix Makefiles'
   ninja
 
 In the above list, the ``cmake`` command configures the project and generates build files for use with the final build tool. In this case, the final build tool is Ninja_: running ``ninja`` actually builds the project.
diff --git a/docs/zh_CN/api-guides/build-system.rst b/docs/zh_CN/api-guides/build-system.rst
index 0e21ecd165d6..3408c273064d 100644
--- a/docs/zh_CN/api-guides/build-system.rst
+++ b/docs/zh_CN/api-guides/build-system.rst
@@ -70,7 +70,7 @@ idf.py
 
     mkdir -p build
     cd build
-    cmake .. -G Ninja   # 或者 'Unix Makefiles'
+    cmake .. -DIDF_TARGET={IDF_TARGET_PATH_NAME} -G Ninja   # 或者 'Unix Makefiles'
     ninja
 
 在上面的命令列表中，``cmake`` 命令对项目进行配置，并生成用于最终构建工具的构建文件。在这个例子中，最终构建工具是 Ninja_: 运行 ``ninja`` 来构建项目。