diff --git a/.obsidian/workspace b/.obsidian/workspace
index 833bee7..d270669 100644
--- a/.obsidian/workspace
+++ b/.obsidian/workspace
@@ -10,7 +10,7 @@
         "state": {
           "type": "markdown",
           "state": {
-            "file": "02. PARA/03. Resources（資源）/C++17/智慧指標.md",
+            "file": "02. PARA/03. Resources（資源）/git/submodule.md",
             "mode": "source",
             "source": true
           }
@@ -23,7 +23,7 @@
         "state": {
           "type": "outline",
           "state": {
-            "file": "02. PARA/03. Resources（資源）/C++17/智慧指標.md"
+            "file": "02. PARA/03. Resources（資源）/git/submodule.md"
           }
         }
       }
@@ -81,7 +81,7 @@
             "state": {
               "type": "backlink",
               "state": {
-                "file": "02. PARA/03. Resources（資源）/C++17/智慧指標.md",
+                "file": "02. PARA/03. Resources（資源）/git/submodule.md",
                 "collapseAll": true,
                 "extraContext": true,
                 "sortOrder": "alphabetical",
@@ -125,8 +125,8 @@
   },
   "active": "94f0e8a81af6c9e2",
   "lastOpenFiles": [
-    "02. PARA/03. Resources（資源）/C++17/智慧指標.md",
     "02. PARA/03. Resources（資源）/git/submodule.md",
+    "02. PARA/03. Resources（資源）/C++17/智慧指標.md",
     "02. PARA/03. Resources（資源）/git.md",
     "02. PARA/03. Resources（資源）/C++17/rvalue.md",
     "02. PARA/03. Resources（資源）/C++17/lvalue.md",
diff --git a/02. PARA/03. Resources（資源）/git/submodule.md b/02. PARA/03. Resources（資源）/git/submodule.md
index e69de29..6877d71 100644
--- a/02. PARA/03. Resources（資源）/git/submodule.md	
+++ b/02. PARA/03. Resources（資源）/git/submodule.md	
@@ -0,0 +1,27 @@
+## 建立 Git Submodule
+```
+git submodule add <repository> [<path>]
+```
+新增之後，用 git status 會發現多了兩個東西需要 commit：
+![[Pasted image 20220608152709.png]]
+
+第一個檔案 .gitmodules，裡面紀錄 submodule 的對應關係，內容大概像這樣：
+```
+[submodule "RobotRunQA"]
+        path = RobotRunQA
+        url = git@github.com-logi:JuiwenHsu/RobotRunQA.git
+```
+
+接下來剩3個步驟：
+1. 提交 `.gitmodule`：`git add .gitmodule ; git push origin master`
+2. 跟git說我們有新增一個submodule：`git submodule init`
+3. 把submodule pull下來：`git submodule update`
+
+## Clone repository and submodule
+當clone一個有submodule的repo的時候，我們還需要 `git submodule init` 跟 `git submodule update` ，例如：
+```
+git clone https://xxx/xxx.git 
+cd xxx
+git submodule init
+git submodule update
+```
\ No newline at end of file
diff --git a/attachments/Pasted image 20220608152709.png b/attachments/Pasted image 20220608152709.png
new file mode 100644
index 0000000..3b407b4
Binary files /dev/null and b/attachments/Pasted image 20220608152709.png differ