diff --git a/Software/Applications/Git/Git_使用说明.md b/Software/Applications/Git/Git_使用说明.md
index 441a495..a115021 100644
--- a/Software/Applications/Git/Git_使用说明.md
+++ b/Software/Applications/Git/Git_使用说明.md
@@ -412,6 +412,7 @@ git commit [...]
 ```bash
 git submodule foreach <command>
 # 例如
+git submodule foreach git checkout master
 git submodule foreach git submodule update
 ```