diff --git a/docs/source/install.md b/docs/source/install.md
index 4291b87afa231164f9df30e7811be95ed129d30e..e8bd5adf91df09d68385ad50cbaa8aa90f4ced63 100644
--- a/docs/source/install.md
+++ b/docs/source/install.md
@@ -63,7 +63,7 @@ pip install paddlespeech -i https://pypi.tuna.tsinghua.edu.cn/simple
 ```
 > If you encounter problem with downloading **nltk_data** while using paddlespeech, it maybe due to your poor network, we suggest you download the [nltk_data](https://paddlespeech.bj.bcebos.com/Parakeet/tools/nltk_data.tar.gz) provided by us, and extract it to your `${HOME}`.
 
-> If you fail to install paddlespeech-ctcdecoders, it doesn't matter.
+> If you fail to install paddlespeech-ctcdecoders, you only can not use deepspeech2 model inference. For other models, it doesn't matter.
  
 ## Medium: Get the Major Functions (Support Linux, mac and windows not support training)
 If you want to get the major function of  `paddlespeech`, you need to do following steps:
diff --git a/docs/source/install_cn.md b/docs/source/install_cn.md
index 9294a2bcdfa15ee29462989fa18fbe93df66b870..75f4174e06ee285f5e6ef85037402ccc5d76512a 100644
--- a/docs/source/install_cn.md
+++ b/docs/source/install_cn.md
@@ -60,7 +60,7 @@ pip install paddlespeech -i https://pypi.tuna.tsinghua.edu.cn/simple
 ```
 > 如果您在使用 paddlespeech 的过程中遇到关于下载 **nltk_data** 的问题，可能是您的网络不佳，我们建议您下载我们提供的 [nltk_data](https://paddlespeech.bj.bcebos.com/Parakeet/tools/nltk_data.tar.gz) 并解压缩到您的 `${HOME}` 目录下。
 
-> 如果出现 paddlespeech-ctcdecoders 无法安装的问题，无须担心，这不影响使用。
+> 如果出现 paddlespeech-ctcdecoders 无法安装的问题，无须担心，这个只影响 deepspeech2 模型的推理，不影响其他模型的使用。
 
 ## 中等： 获取主要功能（支持 Linux， Mac 和 Windows 不支持训练）
 如果你想要使用 `paddlespeech` 的主要功能。你需要完成以下几个步骤