diff --git a/README.md b/README.md
index 3e42a11fbc32cb04d9fb215ec402dccf4bb504e9..9a9036c7ed86ba52b1b9511bbc302390aec2265a 100644
--- a/README.md
+++ b/README.md
@@ -65,6 +65,7 @@ python -m paddle_serving_server.serve --model uci_housing_model --thread 10 --po
 | `port` | int | `9292` | Exposed port of current service to users|
 | `name` | str | `""` | Service name, can be used to generate HTTP request url |
 | `model` | str | `""` | Path of paddle model directory to be served |
+| `mem_optim` | bool | `False` | Enable memory optimization |
 
 Here, we use `curl` to send a HTTP POST request to the service we just started. Users can use any python library to send HTTP POST as well, e.g, [requests](https://requests.readthedocs.io/en/master/).
 </center>
diff --git a/README_CN.md b/README_CN.md
index f379dec0bca6a979513d86b95dafeb2ce812cf5e..07c9e1f236a9fa14fd5edf629b8dd1b6a4481cf7 100644
--- a/README_CN.md
+++ b/README_CN.md
@@ -69,6 +69,7 @@ python -m paddle_serving_server.serve --model uci_housing_model --thread 10 --po
 | `port` | int | `9292` | Exposed port of current service to users|
 | `name` | str | `""` | Service name, can be used to generate HTTP request url |
 | `model` | str | `""` | Path of paddle model directory to be served |
+| `mem_optim` | bool | `False` | Enable memory optimization |
 
 我们使用 `curl` 命令来发送HTTP POST请求给刚刚启动的服务。用户也可以调用python库来发送HTTP POST请求，请参考英文文档 [requests](https://requests.readthedocs.io/en/master/)。
 </center>