diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index 61c1d8c6..8f9c4880 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -29,7 +29,13 @@ Index:
 > This project uses `git submodule`. When cloning, please ensure that the submodule is also pulled.
 >
 > ```bash
-> git clone --recurse-submodules https://github.com/certimate-go/certimate.git
+> # Option 1: Direct recursive pull during cloning
+> > git clone --recurse-submodules https://github.com/certimate-go/certimate.git
+>
+> # Option 2: Clone first, then initialize
+> git clone https://github.com/certimate-go/certimate.git
+> cd certimate
+> git submodule update --init --recursive
 > ```
 
 ### Prerequisites
diff --git a/CONTRIBUTING_zh.md b/CONTRIBUTING_zh.md
index e333abed..7b91f670 100644
--- a/CONTRIBUTING_zh.md
+++ b/CONTRIBUTING_zh.md
@@ -29,7 +29,13 @@
 > 本项目使用了 `git submodule` 特性，克隆时请务必确保嵌套子模块也被拉取。
 >
 > ```bash
+> # 方式一：克隆时直接递归拉取
 > git clone --recurse-submodules https://github.com/certimate-go/certimate.git
+>
+> # 方式二：先克隆，再初始化
+> git clone https://github.com/certimate-go/certimate.git
+> cd certimate
+> git submodule update --init --recursive
 > ```
 
 ### 要求