diff --git a/.vscode/settings.json b/.vscode/settings.json
index 3d0df8c4..3998c1c9 100644
--- a/.vscode/settings.json
+++ b/.vscode/settings.json
@@ -14,6 +14,7 @@
     },
     "git.ignoredRepositories": [
         "./includes/testlib",
-        "./includes/ac-library"
+        "./includes/ac-library",
+        "./includes/ac-library/*"
     ],
 }
diff --git a/README.md b/README.md
index eda5ff08..86c2c0b6 100644
--- a/README.md
+++ b/README.md
@@ -47,13 +47,13 @@
 在克隆仓库前请先安装 Git LFS，并使用如下命令以获得更快的克隆速度：
 
 ```bash
-git lfs clone https://git.sb/baoshuo/OI-codes.git --recursive
+git lfs clone https://git.sb/baoshuo/OI-codes.git
 ```
 
 如果克隆仓库时不需要拉取测试数据，可以使用以下命令：
 
 ```bash
-GIT_LFS_SKIP_SMUDGE=1 git clone https://git.sb/baoshuo/OI-codes.git --recursive
+GIT_LFS_SKIP_SMUDGE=1 git clone https://git.sb/baoshuo/OI-codes.git
 ```
 
 后期如果希望再次拉取测试数据，可以使用以下命令：
@@ -69,6 +69,12 @@ git lfs pull
 - [MikeMirzayanov/testlib](https://github.com/MikeMirzayanov/testlib)
 - [atcoder/ac-library](https://github.com/atcoder/ac-library)
 
+在克隆仓库后需要运行以下命令检出子模块：
+
+```bash
+git submodule update --init --recursive
+```
+
 ## 文件目录结构
 
 | 文件夹                                | 测评系统                                                                                                                                              | 账号                                                               | 说明                                |