diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index 3c36cffcb4eeaaf7f8cff5167777628dd2697e7d..b1b02bcc2f4fd14297715bcf5bfd1617e3d5f0c9 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -58,6 +58,8 @@ PaddlePaddle uses this [Git branching model](http://nvie.com/posts/a-successful-
     create mode 100644 233
    ```
 
+	NOTE: The `yapf` installed by `pip install pre-commit` and `conda install -c conda-forge pre-commit` is slightly different. Paddle developers use `pip install pre-commit`.
+
 1. Build and test
 
    Users can build PaddlePaddle natively on Linux and Mac OS X.  But to unify the building environment and to make it easy for debugging, the recommended way is [using Docker](https://github.com/PaddlePaddle/Paddle/blob/develop/doc/howto/dev/build_en.md).
diff --git a/doc/v2/dev/contribute_to_paddle_cn.md b/doc/v2/dev/contribute_to_paddle_cn.md
index d8bf093e09b53b302225739fa67146adc7976e4b..add06e42f1bbd221b48eb83e4e84d4a7c89e7483 100644
--- a/doc/v2/dev/contribute_to_paddle_cn.md
+++ b/doc/v2/dev/contribute_to_paddle_cn.md
@@ -51,6 +51,8 @@ Paddle 开发人员使用 [pre-commit](http://pre-commit.com/) 工具来管理 G
 
 Paddle 使用 `clang-format` 来调整 C/C++ 源代码格式，请确保 `clang-format` 版本在 3.8 以上。
 
+注：通过`pip install pre-commit`和`conda install -c conda-forge pre-commit`安装的`yapf`稍有不同的，Paddle 开发人员使用的是`pip install pre-commit`。
+
 ## 开始开发
 
 在本例中，我删除了 README.md 中的一行，并创建了一个新文件。